{"title":"Thyroid Function Blood Test Home Kits UK","description":"\u003cp\u003e \u003c\/p\u003e\n\u003cstyle\u003e.tht{--ink:#1d2433;--muted:#656c78;--navy:#18263f;--blue:#416b72;--sage:#637a75;--sand:#eee8df;--cream:#f8f4ef;--white:#fff;--line:#ddd8d1;--warn:#7d3030;--warn-bg:#f8e5e3;color:var(--ink);font-family:inherit;font-size:16px;line-height:1.68;margin:0 auto;max-width:1240px;padding:10px;background:linear-gradient(180deg,#fcfbf9 0%,#f5f1ec 100%);border-radius:18px;overflow:hidden}.tht,.tht *{box-sizing:border-box;min-width:0}.tht img{max-width:100%}.tht a,.tht p,.tht li,.tht dd,.tht td,.tht th,.tht summary,.tht span,.tht strong{overflow-wrap:anywhere}.tht h1,.tht h2,.tht h3,.tht h4{font-family:Georgia,\"Times New Roman\",serif;font-weight:500;line-height:1.14;margin:0 0 14px;text-wrap:balance}.tht h1{font-size:clamp(34px,10vw,64px);letter-spacing:-.038em}.tht h2{font-size:clamp(28px,7vw,43px);letter-spacing:-.025em}.tht h3{font-size:clamp(22px,5.4vw,31px)}.tht 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rgba(26,38,57,.17);left:36px;max-width:440px;padding:24px;position:absolute;top:50%;transform:translateY(-50%)}.tht_table_wrap{overflow-x:auto}.tht_table{border-collapse:collapse;min-width:850px}.tht_table thead{display:table-header-group}.tht_table tbody{display:table-row-group}.tht_table tr{display:table-row;margin:0;padding:0}.tht_table th,.tht_table td{display:table-cell;width:auto}.tht_table th{background:var(--cream);border-bottom:1px solid var(--line);color:var(--blue);font-size:11px;letter-spacing:.06em;padding:14px;text-align:left;text-transform:uppercase;vertical-align:top}.tht_table td{border-bottom:1px solid var(--line);padding:14px;vertical-align:top}.tht_table td::before{display:none}.tht_table tr{background:transparent;border:0;border-radius:0}}@media(prefers-reduced-motion:reduce){.tht *{scroll-behavior:auto!important;transition:none!important}}\u003c\/style\u003e\n\u003carticle class=\"tht\"\u003e\n\u003csection class=\"tht_hero\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003ePrivate at-home thyroid testing\u003c\/p\u003e\n\u003ch1\u003eHome Thyroid Test Kits \u0026amp; Private Blood Tests UK\u003c\/h1\u003e\n\u003cdiv class=\"tht_top_reviewed\"\u003e\n\u003cspan\u003eMedically reviewed\u003c\/span\u003e\u003cstrong\u003eReviewed by the Grace Belgravia Medical Expert Board\u003c\/strong\u003e\u003csmall\u003eLast reviewed 27 July 2026\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cp class=\"tht_lead\"\u003e\u003cstrong\u003eCompare focused and advanced thyroid function blood tests from home, including TSH, T3, T4 and thyroid antibody testing.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eChoose a private thyroid test according to the question you want to answer. A focused hormone panel can show the relationship between thyroid-stimulating hormone and circulating thyroid hormones, while a broader test may add antibody context where autoimmune thyroid disease is being considered.\u003c\/p\u003e\n\u003cdiv class=\"tht_actions\"\u003e\n\u003ca href=\"#test-finder\" class=\"tht_button tht_button_primary\"\u003eFind a suitable thyroid test\u003c\/a\u003e\u003ca href=\"#compare-tests\" class=\"tht_button tht_button_secondary\"\u003eCompare both home kits\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_stats\"\u003e\n\u003cdiv class=\"tht_stat\"\u003e\n\u003cstrong\u003e2 private home kits\u003c\/strong\u003e\u003cspan\u003eFocused thyroid function and broader hormone-and-antibody testing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_stat\"\u003e\n\u003cstrong\u003eHome blood collection\u003c\/strong\u003e\u003cspan\u003eFollow the sample and return instructions supplied with the selected test\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_stat\"\u003e\n\u003cstrong\u003eTSH, T3 and T4 context\u003c\/strong\u003e\u003cspan\u003eUnderstand how pituitary signalling and thyroid hormones are considered together\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_stat\"\u003e\n\u003cstrong\u003eResponsible limitations\u003c\/strong\u003e\u003cspan\u003eA home result does not diagnose the cause of symptoms by itself\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cfigure class=\"tht_banner\"\u003e\u003cimg loading=\"eager\" height=\"900\" width=\"1600\" alt=\"Woman considering a private home thyroid blood test in a refined British interior\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/lifestyle_6.png?v=1785178435\"\u003e\n\u003cfigcaption\u003e\u003cspan class=\"tht_eyebrow\"\u003eGrace Belgravia at home\u003c\/span\u003e\u003cstrong\u003eThyroid testing with clearer choices\u003c\/strong\u003e\u003cspan\u003eCompare a focused function test with a broader antibody-aware panel before ordering.\u003c\/span\u003e\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cdiv class=\"tht_warning\"\u003e\n\u003cstrong\u003eUrgent symptoms should not wait for a home thyroid test.\u003c\/strong\u003e\n\u003cp\u003eSeek urgent medical help for chest pain, severe breathlessness, fainting, marked confusion or agitation, a very fast or irregular heartbeat, or neck swelling that affects breathing or swallowing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cnav aria-label=\"Page sections\" class=\"tht_jump\"\u003e\u003ca href=\"#test-finder\"\u003e\u003cspan\u003eTest finder\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#symptoms\"\u003e\u003cspan\u003eSymptoms\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#browse-tests\"\u003e\u003cspan\u003eAll tests\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#compare-tests\"\u003e\u003cspan\u003eCompare\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#biomarkers\"\u003e\u003cspan\u003eBiomarkers\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#preparation\"\u003e\u003cspan\u003ePreparation\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#medical-review\"\u003e\u003cspan\u003eMedical review\u003c\/span\u003e\u003c\/a\u003e\u003ca href=\"#faqs\"\u003e\u003cspan\u003eFAQs\u003c\/span\u003e\u003c\/a\u003e\u003c\/nav\u003e\u003c\/section\u003e\n\u003csection id=\"test-finder\" class=\"tht_section\"\u003e\n\u003cdiv class=\"tht_selector\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eInteractive thyroid test finder\u003c\/p\u003e\n\u003ch2\u003eWhat would you like to understand?\u003c\/h2\u003e\n\u003cp class=\"tht_selector_intro\"\u003eChoose the closest option. This tool directs you to a relevant product or guidance section; it does not diagnose thyroid disease.\u003c\/p\u003e\n\u003cdiv class=\"tht_selector_buttons\"\u003e\n\u003cbutton aria-pressed=\"false\" data-choice=\"first\" type=\"button\" class=\"tht_selector_button\"\u003eI want a first look at thyroid function\u003c\/button\u003e\u003cbutton aria-pressed=\"false\" data-choice=\"antibodies\" type=\"button\" class=\"tht_selector_button\"\u003eI want thyroid antibody context too\u003c\/button\u003e\u003cbutton aria-pressed=\"false\" data-choice=\"monitoring\" type=\"button\" class=\"tht_selector_button\"\u003eI already take thyroid medicine\u003c\/button\u003e\u003cbutton aria-pressed=\"false\" data-choice=\"pregnancy\" type=\"button\" class=\"tht_selector_button\"\u003eI am pregnant or trying to conceive\u003c\/button\u003e\u003cbutton aria-pressed=\"false\" data-choice=\"neck\" type=\"button\" class=\"tht_selector_button\"\u003eI have a lump or swelling in my neck\u003c\/button\u003e\u003cbutton aria-pressed=\"false\" data-choice=\"unsure\" type=\"button\" class=\"tht_selector_button\"\u003eI am not sure which test to choose\u003c\/button\u003e\n\u003c\/div\u003e\n\u003cdiv aria-live=\"polite\" id=\"tht-selector-result\" class=\"tht_selector_result\"\u003e\n\u003ch3\u003eChoose a question above\u003c\/h3\u003e\n\u003cp\u003eYour result will explain whether the focused thyroid test, advanced test or clinical assessment is the more appropriate next route.\u003c\/p\u003e\n\u003ca href=\"#compare-tests\" class=\"tht_button tht_button_secondary\"\u003eCompare the thyroid tests\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cnoscript\u003e\u003cdiv class=\"tht_noscript\"\u003eJavaScript is disabled. Use the comparison section below to choose between the focused and advanced thyroid tests.\u003c\/div\u003e\u003c\/noscript\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"symptoms\" class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eSymptoms and testing context\u003c\/p\u003e\n\u003ch2\u003eWhy people consider a private thyroid blood test\u003c\/h2\u003e\n\u003cp\u003eThyroid symptoms can be gradual, overlap with many other conditions and occur even when thyroid function is normal. Testing may provide useful laboratory context, but the result should be considered alongside symptoms, medicines, pregnancy status, recent illness and medical history.\u003c\/p\u003e\n\u003cdiv class=\"tht_symptom_grid\"\u003e\n\u003cdiv class=\"tht_symptom\"\u003e\n\u003cstrong\u003ePersistent tiredness or feeling cold\u003c\/strong\u003e\u003cspan\u003eThese may occur with an underactive thyroid but also with anaemia, sleep problems, nutritional deficiency and other conditions.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_symptom\"\u003e\n\u003cstrong\u003eUnexplained weight or appetite change\u003c\/strong\u003e\u003cspan\u003eWeight gain or loss is non-specific and should not be attributed to thyroid function without wider assessment.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_symptom\"\u003e\n\u003cstrong\u003ePalpitations, tremor or heat intolerance\u003c\/strong\u003e\u003cspan\u003eThese can occur with an overactive thyroid and can also have cardiac, medicine-related or anxiety-related causes.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_symptom\"\u003e\n\u003cstrong\u003eHair, skin or bowel changes\u003c\/strong\u003e\u003cspan\u003eDry skin, hair thinning and constipation or more frequent bowel movements may prompt discussion but are not diagnostic.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_symptom\"\u003e\n\u003cstrong\u003ePeriod, fertility or pregnancy questions\u003c\/strong\u003e\u003cspan\u003eThyroid assessment may form part of clinical investigation, particularly when pregnancy-specific interpretation is needed.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_symptom\"\u003e\n\u003cstrong\u003eMood, concentration or sleep changes\u003c\/strong\u003e\u003cspan\u003eBrain fog, low mood, irritability and disturbed sleep can have several physical and psychological explanations.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_notice\"\u003e\n\u003cstrong\u003eA symptom checklist cannot confirm thyroid disease.\u003c\/strong\u003e\n\u003cp\u003eNICE recommends choosing tests according to the clinical setting and interpreting TSH with free thyroid hormones where indicated. \u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.nice.org.uk\/guidance\/ng145\/chapter\/recommendations\" target=\"_blank\"\u003eRead the NICE thyroid disease recommendations\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eFocused or broader testing?\u003c\/p\u003e\n\u003ch2\u003eChoose the depth of thyroid information you need\u003c\/h2\u003e\n\u003cdiv class=\"tht_split\"\u003e\n\u003cdiv class=\"tht_split_panel\"\u003e\n\u003ch3\u003eStart with thyroid function\u003c\/h3\u003e\n\u003cp\u003eThe focused home thyroid test reports TSH, free T3 and free T4. It is designed for people who want a direct view of the hormone pattern without choosing the wider antibody panel.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUseful when the main question concerns thyroid function\u003c\/li\u003e\n\u003cli\u003eShows TSH alongside free thyroid hormones\u003c\/li\u003e\n\u003cli\u003eMay support discussion of possible underactive or overactive patterns\u003c\/li\u003e\n\u003cli\u003eDoes not identify every possible cause of an abnormal result\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ca href=\"\/products\/thyroid-function-test\" class=\"tht_button tht_button_secondary\"\u003eView the focused thyroid test\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_split_panel\"\u003e\n\u003ch3\u003eAdd autoimmune context\u003c\/h3\u003e\n\u003cp\u003eThe advanced home thyroid test combines thyroid-hormone assessment with thyroid antibody markers listed on the individual product page. It may be relevant when the question extends beyond hormone levels alone.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eBroader thyroid function and antibody context\u003c\/li\u003e\n\u003cli\u003eDesigned for people comparing possible autoimmune information\u003c\/li\u003e\n\u003cli\u003eAntibody positivity does not automatically mean current thyroid dysfunction\u003c\/li\u003e\n\u003cli\u003eThe exact marker list should be checked before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ca href=\"\/products\/advanced-thyroid-hormones\" class=\"tht_button tht_button_secondary\"\u003eView the advanced thyroid test\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eA considered home-testing experience\u003c\/p\u003e\n\u003ch2\u003ePrivate collection with clear preparation guidance\u003c\/h2\u003e\n\u003cdiv class=\"tht_lifestyle_grid\"\u003e\n\u003cfigure class=\"tht_lifestyle_figure\"\u003e\u003cimg loading=\"lazy\" height=\"675\" width=\"1200\" alt=\"Woman reading private thyroid test guidance at home\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/lifestyle_8.png?v=1785178434\"\u003e\n\u003cfigcaption\u003e\u003cspan class=\"tht_eyebrow\"\u003eUnderstand the markers\u003c\/span\u003e\u003cstrong\u003eKnow what each thyroid result can and cannot show\u003c\/strong\u003e\n\u003cp\u003eUse the biomarker guide and comparison sections before choosing your kit.\u003c\/p\u003e\n\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003cfigure class=\"tht_lifestyle_figure\"\u003e\u003cimg loading=\"lazy\" height=\"675\" width=\"1200\" alt=\"Private thyroid home blood test kit in an elegant British home\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/lifestyle_2.png?v=1785178433\"\u003e\n\u003cfigcaption\u003e\u003cspan class=\"tht_eyebrow\"\u003eDiscreet home testing\u003c\/span\u003e\u003cstrong\u003eCollect privately and return the sample as instructed\u003c\/strong\u003e\n\u003cp\u003eRecord relevant medicines, supplements, pregnancy status and recent illness.\u003c\/p\u003e\n\u003c\/figcaption\u003e\n\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"browse-tests\" class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eBrowse the collection\u003c\/p\u003e\n\u003ch2\u003ePrivate home thyroid blood tests UK\u003c\/h2\u003e\n\u003cp\u003eBoth tests are designed for at-home collection, but they answer different questions. Check the definitive product specification, sample requirements and preparation instructions before ordering.\u003c\/p\u003e\n\u003cdiv class=\"tht_products\"\u003e\n\u003carticle class=\"tht_product\"\u003e\u003ca href=\"\/products\/thyroid-function-test\" class=\"tht_product_media\"\u003e\u003cimg loading=\"lazy\" height=\"680\" width=\"900\" alt=\"Home Thyroid Test Kit UK – TSH, T3 and T4 Blood Test\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Home_Thyroid_Test_Kit_UK_-_TSH_T3_T4_Blood_Test.png?v=1785167812\"\u003e\u003c\/a\u003e\n\u003cdiv class=\"tht_product_body\"\u003e\n\u003cspan class=\"tht_tag\"\u003eFocused thyroid function\u003c\/span\u003e\n\u003ch3\u003e\u003ca href=\"\/products\/thyroid-function-test\"\u003eHome Thyroid Test Kit UK – TSH, T3 \u0026amp; T4 Blood Test\u003c\/a\u003e\u003c\/h3\u003e\n\u003cp\u003eA focused private thyroid function blood test for people who want TSH, free T3 and free T4 reported together from one home collection.\u003c\/p\u003e\n\u003cdiv\u003eReportedTSH, free T3 and free T4\u003c\/div\u003e\n\u003cdiv\u003eBest suited toA direct first look at the relationship between pituitary signalling and circulating thyroid hormones\u003c\/div\u003e\n\u003cdiv\u003eImportant contextMedicines, pregnancy, recent illness, supplements and laboratory reference ranges can affect interpretation\u003c\/div\u003e\n\u003ca href=\"\/products\/thyroid-function-test\" class=\"tht_button tht_button_secondary\"\u003eView focused thyroid test\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003carticle class=\"tht_product\"\u003e\u003ca href=\"\/products\/advanced-thyroid-hormones\" class=\"tht_product_media\"\u003e\u003cimg loading=\"lazy\" height=\"680\" width=\"900\" alt=\"Home Advanced Thyroid Test Kit UK – Hormones and Antibodies\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Home_Advanced_Thyroid_Test_Kit_UK_-_Hormones_Antibodies.png?v=1785150104\"\u003e\u003c\/a\u003e\n\u003cdiv class=\"tht_product_body\"\u003e\n\u003cspan class=\"tht_tag\"\u003eHormones + antibodies\u003c\/span\u003e\n\u003ch3\u003e\u003ca href=\"\/products\/advanced-thyroid-hormones\"\u003eHome Advanced Thyroid Test Kit UK – Hormones \u0026amp; Antibodies\u003c\/a\u003e\u003c\/h3\u003e\n\u003cp\u003eA broader private thyroid panel for people who want thyroid function considered with the antibody markers specified for this product.\u003c\/p\u003e\n\u003cdiv\u003eReportedThyroid hormones and antibody biomarkers shown on the individual product page\u003c\/div\u003e\n\u003cdiv\u003eBest suited toPeople seeking broader autoimmune thyroid context rather than hormone levels alone\u003c\/div\u003e\n\u003cdiv\u003eImportant contextPositive thyroid antibodies can occur without current hormone dysfunction and require clinical interpretation\u003c\/div\u003e\n\u003ca href=\"\/products\/advanced-thyroid-hormones\" class=\"tht_button tht_button_secondary\"\u003eView advanced thyroid test\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/article\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"compare-tests\" class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eSide-by-side comparison\u003c\/p\u003e\n\u003ch2\u003eCompare home thyroid test kits\u003c\/h2\u003e\n\u003cp class=\"tht_compare_intro\"\u003eThe best test is not automatically the one with the most biomarkers. Choose according to whether you need a focused thyroid-hormone picture or additional antibody context.\u003c\/p\u003e\n\u003cdiv class=\"tht_table_wrap\"\u003e\n\u003ctable class=\"tht_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eTest\u003c\/th\u003e\n\u003cth\u003eMain scope\u003c\/th\u003e\n\u003cth\u003eMay suit\u003c\/th\u003e\n\u003cth\u003eKey limitation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Test\"\u003e\u003ca href=\"\/products\/thyroid-function-test\"\u003e\u003cstrong\u003eTSH, T3 \u0026amp; T4 Blood Test\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Main scope\"\u003eFocused thyroid function using TSH, free T3 and free T4\u003c\/td\u003e\n\u003ctd data-label=\"May suit\"\u003eA first private thyroid check or hormone-focused monitoring question\u003c\/td\u003e\n\u003ctd data-label=\"Key limitation\"\u003eDoes not provide the wider antibody context included in the advanced product\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd data-label=\"Test\"\u003e\u003ca href=\"\/products\/advanced-thyroid-hormones\"\u003e\u003cstrong\u003eAdvanced Hormones \u0026amp; Antibodies Test\u003c\/strong\u003e\u003c\/a\u003e\u003c\/td\u003e\n\u003ctd data-label=\"Main scope\"\u003eThyroid function with selected thyroid antibody markers\u003c\/td\u003e\n\u003ctd data-label=\"May suit\"\u003ePeople who want broader context around possible autoimmune thyroid activity\u003c\/td\u003e\n\u003ctd data-label=\"Key limitation\"\u003eAntibodies alone do not diagnose current hypo- or hyperthyroidism\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_info\"\u003e\n\u003cstrong\u003eAlready taking levothyroxine, liothyronine or antithyroid medicine?\u003c\/strong\u003e\n\u003cp\u003eFollow the timing instructions from the clinician managing your treatment. A home result should not be used to start, stop or change prescribed thyroid medication without advice.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"biomarkers\" class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eThyroid biomarker guide\u003c\/p\u003e\n\u003ch2\u003eWhat TSH, T3, T4 and thyroid antibodies mean\u003c\/h2\u003e\n\u003cp\u003eNHS laboratory guidance describes thyroid function tests as including TSH, free T4 and free T3. These values are interpreted as a pattern rather than as isolated numbers. \u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.gloshospitals.nhs.uk\/our-services\/services-we-offer\/pathology\/tests-and-investigations\/thyroid-function-tests-tsh-ft4-ft3\/\" target=\"_blank\"\u003eView NHS thyroid function test information\u003c\/a\u003e.\u003c\/p\u003e\n\u003cdiv class=\"tht_glossary\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eTSH: thyroid-stimulating hormone\u003c\/summary\u003e\n\u003cp\u003eTSH is produced by the pituitary gland and signals the thyroid to make thyroid hormones. A raised or suppressed TSH can be important, but the meaning depends on free T4, free T3, medicines, illness and clinical context.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eFree T4: free thyroxine\u003c\/summary\u003e\n\u003cp\u003eT4 is the principal hormone released by the thyroid. Free T4 represents the unbound fraction available to tissues and is commonly considered with TSH when assessing possible underactive or overactive thyroid patterns.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eFree T3: free triiodothyronine\u003c\/summary\u003e\n\u003cp\u003eT3 is the more biologically active thyroid hormone. Free T3 can be particularly useful in selected suspected hyperthyroid patterns, while illness and assay factors can complicate interpretation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eThyroid peroxidase antibodies\u003c\/summary\u003e\n\u003cp\u003eTPO antibodies may support autoimmune thyroid context when included. NICE advises considering TPO antibodies in adults with TSH above the reference range and advises against routinely repeating them.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eThyroglobulin antibodies\u003c\/summary\u003e\n\u003cp\u003eThyroglobulin antibodies are another marker of thyroid autoimmunity. Their presence does not, by itself, establish how well the thyroid is currently functioning.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eReference ranges\u003c\/summary\u003e\n\u003cp\u003eLaboratories use method-specific reference intervals. Age, pregnancy, medicines and assay methodology can alter how a result should be interpreted, so a number should not be compared casually with a range from another provider.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eUnderstanding result patterns\u003c\/p\u003e\n\u003ch2\u003eWhy thyroid results must be read together\u003c\/h2\u003e\n\u003cdiv class=\"tht_fact_grid\"\u003e\n\u003cdiv class=\"tht_fact\"\u003e\n\u003cstrong\u003eRaised TSH with low free T4\u003c\/strong\u003e\u003cspan\u003eThis pattern can be consistent with primary hypothyroidism, but diagnosis and cause require clinical assessment.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_fact\"\u003e\n\u003cstrong\u003eLow TSH with raised free T4 or free T3\u003c\/strong\u003e\u003cspan\u003eThis can be seen in hyperthyroidism, although medicines, pregnancy and assay interference can create misleading patterns.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_fact\"\u003e\n\u003cstrong\u003eAbnormal TSH with normal free T4\u003c\/strong\u003e\u003cspan\u003eThis may need repeat testing and context before it is labelled or treated, particularly when the change is mild.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_fact\"\u003e\n\u003cstrong\u003ePositive antibodies with normal hormones\u003c\/strong\u003e\u003cspan\u003eAntibody positivity can indicate autoimmune tendency without proving current thyroid dysfunction.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_fact\"\u003e\n\u003cstrong\u003eSymptoms with normal tests\u003c\/strong\u003e\u003cspan\u003eSymptoms may have another cause, and a normal thyroid panel should not end appropriate clinical investigation.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_fact\"\u003e\n\u003cstrong\u003eUnexpected or contradictory results\u003c\/strong\u003e\u003cspan\u003eRepeat testing, venous sampling or laboratory discussion may be needed when the biochemical pattern does not fit the clinical picture.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eA peer-reviewed review of thyroid testing emphasises that physiology, assay limitations and the clinical picture matter when values are mildly abnormal or discordant. \u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/27231117\/\" target=\"_blank\"\u003eRead the review indexed by PubMed\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection id=\"preparation\" class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003ePreparation and accuracy\u003c\/p\u003e\n\u003ch2\u003eBefore taking a home thyroid blood test\u003c\/h2\u003e\n\u003cdiv class=\"tht_process_grid\"\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e1\u003c\/span\u003e\n\u003ch3\u003eRead the kit instructions\u003c\/h3\u003e\n\u003cp\u003eCheck sample type, collection timing, fasting advice and return requirements for the exact product.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e2\u003c\/span\u003e\n\u003ch3\u003eRecord thyroid medicines\u003c\/h3\u003e\n\u003cp\u003eNote levothyroxine, liothyronine, carbimazole, propylthiouracil and when the most recent dose was taken.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e3\u003c\/span\u003e\n\u003ch3\u003eList relevant medicines\u003c\/h3\u003e\n\u003cp\u003eLithium, amiodarone, steroids and other medicines can affect thyroid physiology or test interpretation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e4\u003c\/span\u003e\n\u003ch3\u003eCheck supplements\u003c\/h3\u003e\n\u003cp\u003eHigh-dose biotin can interfere with some immunoassays. Follow the laboratory’s instructions rather than stopping prescribed treatment independently.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e5\u003c\/span\u003e\n\u003ch3\u003eNote pregnancy and illness\u003c\/h3\u003e\n\u003cp\u003ePregnancy requires trimester-aware interpretation, while significant recent illness can temporarily alter thyroid results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e6\u003c\/span\u003e\n\u003ch3\u003ePlan appropriate follow-up\u003c\/h3\u003e\n\u003cp\u003eUnexpected results may require repeat testing, venous sampling or assessment by a GP or endocrinology professional.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_notice\"\u003e\n\u003cstrong\u003eBiotin is an important example of laboratory interference.\u003c\/strong\u003e\n\u003cp\u003eUniversity and peer-reviewed laboratory sources describe how high-dose biotin can produce misleading results in some thyroid immunoassays. \u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/labmed.uw.edu\/test-guide\/view\/interferences_and_limitations\" target=\"_blank\"\u003eRead the University of Washington laboratory guidance\u003c\/a\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003ePregnancy, fertility and thyroid antibodies\u003c\/p\u003e\n\u003ch2\u003eWhen clinical interpretation is especially important\u003c\/h2\u003e\n\u003cdiv class=\"tht_split\"\u003e\n\u003cdiv class=\"tht_split_panel\"\u003e\n\u003ch3\u003ePregnancy and preconception\u003c\/h3\u003e\n\u003cp\u003ePregnancy changes thyroid physiology and reference intervals. A home result should not delay maternity, fertility or endocrine advice when thyroid disease is suspected or already diagnosed.\u003c\/p\u003e\n\u003cp\u003eA peer-reviewed review notes that TSH remains a principal first test in pregnancy but requires trimester-specific interpretation, while free T4 methods can be affected by analytical factors.\u003c\/p\u003e\n\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/32863110\/\" target=\"_blank\"\u003eRead the pregnancy interpretation review\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_split_panel\"\u003e\n\u003ch3\u003eAntibodies and evolving research\u003c\/h3\u003e\n\u003cp\u003eUK university teams continue to investigate why thyroid antibodies may be associated with pregnancy outcomes even when hormone levels appear normal.\u003c\/p\u003e\n\u003cp\u003eResearch updates from the University of Birmingham and the University of Cambridge illustrate that thyroid autoimmunity remains an active scientific field rather than a simple positive-or-negative diagnosis.\u003c\/p\u003e\n\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.birminghambrc.nihr.ac.uk\/news-and-events\/thyroid-miscarriage-connection\" target=\"_blank\"\u003eUniversity of Birmingham research\u003c\/a\u003e\u003cbr\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.mrl.ims.cam.ac.uk\/news\/hidden-mutations-immune-cells-point-new-mechanism-thyroid-autoimmunity\" target=\"_blank\"\u003eUniversity of Cambridge research\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eHow home thyroid testing works\u003c\/p\u003e\n\u003ch2\u003eFrom choosing your kit to reviewing the result\u003c\/h2\u003e\n\u003cdiv class=\"tht_process_grid\"\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e1\u003c\/span\u003e\n\u003ch3\u003eChoose the question\u003c\/h3\u003e\n\u003cp\u003eSelect focused thyroid function or the broader hormones-and-antibodies panel.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e2\u003c\/span\u003e\n\u003ch3\u003eReceive the home kit\u003c\/h3\u003e\n\u003cp\u003eReview the enclosed collection, registration and return instructions before starting.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e3\u003c\/span\u003e\n\u003ch3\u003ePrepare carefully\u003c\/h3\u003e\n\u003cp\u003eRecord medicines, supplements, pregnancy status and recent illness that may affect interpretation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e4\u003c\/span\u003e\n\u003ch3\u003eCollect the sample\u003c\/h3\u003e\n\u003cp\u003eUse the supplied equipment and provide the required blood volume without contaminating the sample.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e5\u003c\/span\u003e\n\u003ch3\u003eReturn for analysis\u003c\/h3\u003e\n\u003cp\u003ePackage and return the sample through the pathway specified in the kit.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_process\"\u003e\n\u003cspan\u003e6\u003c\/span\u003e\n\u003ch3\u003eReview and follow up\u003c\/h3\u003e\n\u003cp\u003eRead the laboratory commentary and arrange clinical review for unexpected or persistent findings.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cdiv class=\"tht_lab_grid\"\u003e\n\u003cdiv class=\"tht_lab_copy\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eLaboratory and testing standards\u003c\/p\u003e\n\u003ch2\u003eHome collection supported by a quality-controlled laboratory pathway\u003c\/h2\u003e\n\u003cp\u003eGrace Belgravia home test kits combine private sample collection with laboratory analysis. Accreditation and equipment claims should always be checked against the individual test specification and the pathway used for that product.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eUKAS-accredited medical laboratory processing where specified\u003c\/li\u003e\n\u003cli\u003eCQC-registered diagnostic and screening pathway where applicable\u003c\/li\u003e\n\u003cli\u003eUKCA- and CE-marked collection equipment where stated\u003c\/li\u003e\n\u003cli\u003eQuality-management controls appropriate to the testing pathway\u003c\/li\u003e\n\u003cli\u003eSecure digital reporting with laboratory commentary\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cdiv class=\"tht_lab_badges\"\u003e\n\u003cspan\u003eUK laboratory pathway\u003c\/span\u003e\u003cspan\u003eQuality controlled\u003c\/span\u003e\u003cspan\u003eSecure reporting\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cfigure class=\"tht_lab_image\"\u003e\u003cimg loading=\"lazy\" height=\"680\" width=\"1600\" alt=\"Grace Belgravia laboratory and testing standards\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Laboratoryand_Testing_Standards.png?v=1785016220\"\u003e\u003c\/figure\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"medical-review\" class=\"tht_section\"\u003e\n\u003cdiv class=\"tht_review_heading\"\u003e\n\u003cdiv\u003e\n\u003cp class=\"tht_eyebrow\"\u003eMedical and editorial review\u003c\/p\u003e\n\u003ch2\u003eMedically checked thyroid testing guidance\u003c\/h2\u003e\n\u003cp\u003eThe collection page has been reviewed for responsible symptom wording, thyroid biomarker context, laboratory limitations and appropriate clinical escalation.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_review_seal\"\u003e\n\u003cspan\u003eMedically\u003c\/span\u003e\u003cstrong\u003eReviewed\u003c\/strong\u003e\u003csmall\u003e27 July 2026\u003c\/small\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_review_grid\"\u003e\n\u003carticle class=\"tht_review_card\"\u003e\n\u003cdiv class=\"tht_review_top\"\u003e\n\u003cdiv class=\"tht_avatar\"\u003e\u003cimg loading=\"lazy\" height=\"144\" width=\"144\" alt=\"Dr Laura Geige\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/5W4A9892.jpg?v=1785070092\"\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"tht_review_label\"\u003eMedical governance\u003c\/span\u003e\n\u003ch3\u003eDr Laura Geige\u003c\/h3\u003e\n\u003cp class=\"tht_review_title\"\u003eMedical Director, Senior Practitioner and Skin Expert\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eReviewed symptom boundaries, medicine-related cautions, referral wording and the distinction between laboratory information and diagnosis.\u003c\/p\u003e\n\u003ca href=\"\/pages\/dr-laura-geige-medical-director-senior-practitioner-and-skin-expert\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003carticle class=\"tht_review_card\"\u003e\n\u003cdiv class=\"tht_review_top\"\u003e\n\u003cdiv aria-label=\"Portrait of Dr Rimas Geiga\" role=\"img\" class=\"tht_avatar tht_avatar_rimas\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"tht_review_label\"\u003eEndocrine and metabolic context\u003c\/span\u003e\n\u003ch3\u003eDr Rimas Geiga\u003c\/h3\u003e\n\u003cp class=\"tht_review_title\"\u003eMedical Doctor, Nutritional Sciences Adviser and Healthy Ageing Expert\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eReviewed TSH, T3 and T4 explanations, metabolic symptom overlap, preparation factors and responsible interpretation of abnormal patterns.\u003c\/p\u003e\n\u003ca href=\"\/pages\/dr-rimas-geiga-medical-doctor-nutritional-sciences-adviser-and-healthy-ageing-expert\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003carticle class=\"tht_review_card\"\u003e\n\u003cdiv class=\"tht_review_top\"\u003e\n\u003cdiv aria-label=\"Portrait of Veronika Matutyte\" role=\"img\" class=\"tht_avatar tht_avatar_veronika\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"tht_review_label\"\u003eQuality and patient safety\u003c\/span\u003e\n\u003ch3\u003eVeronika Matutyte\u003c\/h3\u003e\n\u003cp class=\"tht_review_title\"\u003eMedical Doctor and Healthcare Management Expert\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003eReviewed laboratory-pathway wording, biotin and medicine cautions, pregnancy safeguards, privacy and next-step guidance.\u003c\/p\u003e\n\u003ca href=\"\/pages\/veronika-matutyte-medical-doctor-and-healthcare-management-expert\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"tht_review_meta\"\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eMedical review date\u003c\/strong\u003e\u003cspan\u003e27 July 2026\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEvidence checked\u003c\/strong\u003e\u003cspan\u003e27 July 2026\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eNext scheduled review\u003c\/strong\u003e\u003cspan\u003eBy 27 July 2027 or earlier if guidance changes\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003ca href=\"\/pages\/medical-advisory-board\"\u003e\u003cstrong\u003eMeet the Grace Belgravia Medical Expert Board\u003c\/strong\u003e\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eAuthoritative references\u003c\/p\u003e\n\u003ch2\u003eUK guidance, research papers and university sources\u003c\/h2\u003e\n\u003cdiv class=\"tht_sources\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eNICE and NHS thyroid guidance\u003c\/summary\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.nice.org.uk\/guidance\/ng145\" target=\"_blank\"\u003eNICE NG145: Thyroid disease assessment and management\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.nhs.uk\/conditions\/underactive-thyroid-hypothyroidism\/diagnosis\/\" target=\"_blank\"\u003eNHS: diagnosing an underactive thyroid\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.nhs.uk\/conditions\/overactive-thyroid-hyperthyroidism\/diagnosis\/\" target=\"_blank\"\u003eNHS: diagnosing an overactive thyroid\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.gloshospitals.nhs.uk\/our-services\/services-we-offer\/pathology\/tests-and-investigations\/thyroid-function-tests-tsh-ft4-ft3\/\" target=\"_blank\"\u003eNHS pathology: TSH, FT4 and FT3 tests\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003ePeer-reviewed thyroid testing publications\u003c\/summary\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/27231117\/\" target=\"_blank\"\u003eBiochemical testing of the thyroid: interpretation review\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pmc.ncbi.nlm.nih.gov\/articles\/PMC5922674\/\" target=\"_blank\"\u003eHow to interpret thyroid function tests\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/29982406\/\" target=\"_blank\"\u003eInterferences with thyroid function immunoassays\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/32863110\/\" target=\"_blank\"\u003eInterpretation of thyroid function tests during pregnancy\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eUK and overseas university research\u003c\/summary\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.birminghambrc.nihr.ac.uk\/news-and-events\/thyroid-miscarriage-connection\" target=\"_blank\"\u003eUniversity of Birmingham: thyroid antibodies and miscarriage research\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/www.mrl.ims.cam.ac.uk\/news\/hidden-mutations-immune-cells-point-new-mechanism-thyroid-autoimmunity\" target=\"_blank\"\u003eUniversity of Cambridge: mechanisms of thyroid autoimmunity\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/eprints.gla.ac.uk\/275945\/1\/275945.pdf\" target=\"_blank\"\u003eUniversity of Glasgow: thyroid antibodies and subclinical hypothyroidism\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca rel=\"nofollow noopener noreferrer\" href=\"https:\/\/labmed.uw.edu\/test-guide\/view\/interferences_and_limitations\" target=\"_blank\"\u003eUniversity of Washington: laboratory interference and limitations\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"faqs\" class=\"tht_section\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eFrequently asked questions\u003c\/p\u003e\n\u003ch2\u003eHome thyroid test kit FAQs\u003c\/h2\u003e\n\u003cdiv class=\"tht_faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhich home thyroid test should I choose?\u003c\/summary\u003e\n\u003cp\u003eChoose the focused TSH, T3 and T4 test when your main question concerns thyroid function. Choose the advanced hormones-and-antibodies product when you also want the thyroid antibody markers listed on that product page.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I take a thyroid blood test at home?\u003c\/summary\u003e\n\u003cp\u003eYes. These products use home sample collection followed by laboratory analysis. Follow the collection, registration and return instructions supplied with the selected kit.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does a thyroid function blood test measure?\u003c\/summary\u003e\n\u003cp\u003eThe focused test reports TSH, free T3 and free T4. These are considered together to assess the pattern of pituitary signalling and circulating thyroid hormones.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan a home thyroid test diagnose hypothyroidism?\u003c\/summary\u003e\n\u003cp\u003eNo single home result should be used alone to diagnose or treat hypothyroidism. Results require interpretation with symptoms, medicines, pregnancy status, illness and often repeat or venous testing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan the tests identify Hashimoto’s disease?\u003c\/summary\u003e\n\u003cp\u003eThe advanced test provides thyroid hormone and antibody context, but antibodies do not by themselves establish current thyroid dysfunction or explain every symptom. Clinical assessment may still be required.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I test while taking levothyroxine?\u003c\/summary\u003e\n\u003cp\u003eTesting may form part of monitoring, but the timing of the sample relative to your dose can matter. Follow your clinician’s instructions and do not change prescribed medication solely because of a home result.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan biotin affect a thyroid blood test?\u003c\/summary\u003e\n\u003cp\u003eHigh-dose biotin can interfere with some laboratory immunoassays. Record supplements and follow the specific laboratory instructions rather than stopping prescribed products without advice.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to fast for a thyroid test?\u003c\/summary\u003e\n\u003cp\u003eFasting requirements depend on the specific product and whether other biomarkers are included. Follow the instructions supplied with the kit.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I use a home thyroid test during pregnancy?\u003c\/summary\u003e\n\u003cp\u003ePregnancy requires trimester-specific interpretation and prompt clinical follow-up where thyroid disease is suspected. Speak with a GP, maternity or endocrine professional rather than relying on a home result alone.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat if my result is outside the reference range?\u003c\/summary\u003e\n\u003cp\u003eRead the laboratory commentary and arrange clinical follow-up. Repeat testing, a venous sample, additional antibody tests, examination or specialist assessment may be appropriate.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat if I have symptoms but normal thyroid results?\u003c\/summary\u003e\n\u003cp\u003eThyroid symptoms are non-specific. Normal results may make primary thyroid dysfunction less likely but do not explain the symptoms, so other causes may need assessment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan a blood test assess a thyroid lump?\u003c\/summary\u003e\n\u003cp\u003eBlood tests assess thyroid biochemistry, not the structure of a lump or nodule. A neck swelling may require examination and imaging, so arrange clinical assessment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"tht_footer\"\u003e\n\u003cp class=\"tht_eyebrow\"\u003eChoose your private thyroid test\u003c\/p\u003e\n\u003ch2\u003eStart with the level of detail that fits your question\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eHome thyroid testing provides selected laboratory information and does not replace medical assessment, diagnosis or treatment.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse the focused kit for TSH, free T3 and free T4, or compare the advanced product when thyroid antibody context is also relevant.\u003c\/p\u003e\n\u003cdiv class=\"tht_actions\"\u003e\n\u003ca href=\"#browse-tests\" class=\"tht_button tht_button_primary\"\u003eBrowse thyroid test kits\u003c\/a\u003e\u003ca href=\"#compare-tests\" class=\"tht_button tht_button_secondary\"\u003eCompare the tests\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/article\u003e\n\u003cp\u003e \u003c\/p\u003e","products":[{"product_id":"thyroid-function-test","title":"Home Thyroid Test Kit UK - TSH, T3 \u0026 T4 Blood Test","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cmeta content=\"width=device-width, initial-scale=1\" name=\"viewport\"\u003e\u003cmeta content=\"Order a home thyroid test kit in the UK. UKAS accredited and CQC registered labs measure TSH, free T3 and free T4 for thyroid function assessment.\" name=\"description\"\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n  .thyroid_product {\n    --thyroid_ink: #2f2a28;\n    --thyroid_muted: #6f625d;\n    --thyroid_taupe: #786863;\n    --thyroid_taupe_dark: #5e4c46;\n    --thyroid_cream: #f5eee3;\n    --thyroid_line: #ded2c5;\n    --thyroid_white: #ffffff;\n    --thyroid_green_bg: #e8f3e9;\n    --thyroid_green_text: #345f3f;\n    --thyroid_amber_bg: #fff1cf;\n    --thyroid_amber_text: #7b5715;\n    --thyroid_orange_bg: #f9e7d7;\n    --thyroid_orange_text: #8a4d2d;\n    --thyroid_red_bg: #f8dfdf;\n    --thyroid_red_text: #8f3535;\n    --thyroid_blue_bg: #e8eef4;\n    --thyroid_blue_text: #405c72;\n    color: var(--thyroid_ink);\n    font-family: inherit;\n    font-size: 16px;\n    line-height: 1.7;\n    margin: 0 auto;\n    max-width: 1120px;\n  }\n\n  .thyroid_product * { box-sizing: border-box; }\n\n  .thyroid_product h2,\n  .thyroid_product h3,\n  .thyroid_product h4 {\n    color: var(--thyroid_ink);\n    line-height: 1.2;\n    margin-top: 0;\n  }\n\n  .thyroid_product h2 {\n    font-family: Georgia, \"Times New Roman\", serif;\n    font-size: clamp(32px, 5vw, 54px);\n    font-weight: 500;\n    margin-bottom: 18px;\n  }\n\n  .thyroid_product h3 {\n    font-family: Georgia, \"Times New Roman\", serif;\n    font-size: clamp(25px, 3vw, 34px);\n    font-weight: 500;\n    margin-bottom: 16px;\n  }\n\n  .thyroid_product h4 { font-size: 18px; margin-bottom: 10px; }\n  .thyroid_product p { margin: 0 0 16px; }\n\n  .thyroid_product ul {\n    margin: 8px 0 18px;\n    padding-left: 22px;\n  }\n\n  .thyroid_product li { margin-bottom: 7px; }\n\n  .thyroid_hero {\n    background: linear-gradient(135deg, var(--thyroid_cream), #fbf8f3);\n    border: 1px solid var(--thyroid_line);\n    border-radius: 22px;\n    margin-bottom: 28px;\n    padding: clamp(24px, 5vw, 52px);\n  }\n\n  .thyroid_eyebrow {\n    color: var(--thyroid_taupe_dark);\n    font-size: 13px;\n    font-weight: 700;\n    letter-spacing: 0.12em;\n    margin-bottom: 12px;\n    text-transform: uppercase;\n  }\n\n  .thyroid_lead {\n    font-size: 19px;\n    max-width: 900px;\n  }\n\n  .thyroid_notice,\n  .thyroid_warning {\n    background: var(--thyroid_white);\n    border-left: 5px solid var(--thyroid_taupe);\n    border-radius: 10px;\n    margin-top: 22px;\n    padding: 17px 19px;\n  }\n\n  .thyroid_warning {\n    background: var(--thyroid_red_bg);\n    border-color: var(--thyroid_red_text);\n    color: #672b2b;\n  }\n\n  .thyroid_grid,\n  .thyroid_steps,\n  .thyroid_method_grid,\n  .thyroid_trust_grid {\n    display: grid;\n    gap: 14px;\n    grid-template-columns: repeat(4, minmax(0, 1fr));\n    margin-top: 22px;\n  }\n\n  .thyroid_steps { grid-template-columns: repeat(3, minmax(0, 1fr)); }\n\n  .thyroid_stat,\n  .thyroid_method_item,\n  .thyroid_trust_item,\n  .thyroid_step {\n    background: rgba(255, 255, 255, 0.84);\n    border: 1px solid var(--thyroid_line);\n    border-radius: 14px;\n    min-height: 112px;\n    padding: 17px;\n  }\n\n  .thyroid_method_item,\n  .thyroid_trust_item { background: #fbf8f3; }\n\n  .thyroid_stat strong,\n  .thyroid_method_item strong,\n  .thyroid_trust_item strong {\n    display: block;\n    font-size: 15px;\n    margin-bottom: 6px;\n  }\n\n  .thyroid_stat strong { font-size: 18px; }\n\n  .thyroid_stat span,\n  .thyroid_method_item span,\n  .thyroid_trust_item span {\n    color: var(--thyroid_muted);\n    font-size: 14px;\n    line-height: 1.55;\n  }\n\n  .thyroid_section {\n    background: var(--thyroid_white);\n    border: 1px solid var(--thyroid_line);\n    border-radius: 18px;\n    margin-bottom: 24px;\n    padding: clamp(22px, 4vw, 38px);\n  }\n\n  .thyroid_table_wrap {\n    overflow-x: auto;\n    width: 100%;\n  }\n\n  .thyroid_table {\n    border-collapse: collapse;\n    margin: 18px 0 4px;\n    min-width: 720px;\n    width: 100%;\n  }\n\n  .thyroid_table th,\n  .thyroid_table td {\n    border-bottom: 1px solid var(--thyroid_line);\n    padding: 15px 14px;\n    text-align: left;\n    vertical-align: top;\n  }\n\n  .thyroid_table th {\n    background: var(--thyroid_cream);\n    color: var(--thyroid_taupe_dark);\n    font-size: 13px;\n    letter-spacing: 0.04em;\n    text-transform: uppercase;\n  }\n\n  .thyroid_table tr:last-child td { border-bottom: 0; }\n  .thyroid_table td:first-child { width: 190px; }\n\n  .thyroid_status {\n    border: 1px solid currentColor;\n    border-radius: 999px;\n    display: inline-block;\n    font-size: 12px;\n    font-weight: 700;\n    line-height: 1.2;\n    padding: 6px 10px;\n    white-space: nowrap;\n  }\n\n  .thyroid_critical { background: var(--thyroid_red_bg); color: var(--thyroid_red_text); }\n  .thyroid_low { background: var(--thyroid_amber_bg); color: var(--thyroid_amber_text); }\n  .thyroid_normal { background: var(--thyroid_green_bg); color: var(--thyroid_green_text); }\n  .thyroid_high { background: var(--thyroid_orange_bg); color: var(--thyroid_orange_text); }\n  .thyroid_info { background: var(--thyroid_blue_bg); color: var(--thyroid_blue_text); }\n\n  .thyroid_step { background: var(--thyroid_cream); }\n\n  .thyroid_step_number {\n    align-items: center;\n    background: var(--thyroid_taupe_dark);\n    border-radius: 50%;\n    color: #ffffff;\n    display: inline-flex;\n    font-weight: 700;\n    height: 32px;\n    justify-content: center;\n    margin-bottom: 10px;\n    width: 32px;\n  }\n\n  .thyroid_biomarker {\n    border: 1px solid var(--thyroid_line);\n    border-radius: 14px;\n    margin-bottom: 14px;\n    overflow: hidden;\n  }\n\n  .thyroid_biomarker summary {\n    align-items: center;\n    background: var(--thyroid_cream);\n    color: var(--thyroid_ink);\n    cursor: pointer;\n    display: flex;\n    font-size: 18px;\n    font-weight: 700;\n    justify-content: space-between;\n    list-style: none;\n    padding: 18px 20px;\n  }\n\n  .thyroid_biomarker summary::-webkit-details-marker,\n  .thyroid_sources summary::-webkit-details-marker { display: none; }\n\n  .thyroid_biomarker summary::after,\n  .thyroid_sources summary::after {\n    color: var(--thyroid_taupe_dark);\n    content: \"+\";\n    font-size: 25px;\n    font-weight: 400;\n    line-height: 1;\n  }\n\n  .thyroid_biomarker[open] summary::after,\n  .thyroid_sources details[open] summary::after { content: \"−\"; }\n\n  .thyroid_biomarker_body { padding: 22px 20px 25px; }\n\n  .thyroid_subnote {\n    background: #fbf8f3;\n    border: 1px solid var(--thyroid_line);\n    border-radius: 11px;\n    margin: 18px 0;\n    padding: 15px 17px;\n  }\n\n  .thyroid_review_grid {\n    display: grid;\n    gap: 14px;\n    grid-template-columns: repeat(3, minmax(0, 1fr));\n    margin-top: 22px;\n  }\n\n  .thyroid_review_card {\n    background: #fbf8f3;\n    border: 1px solid var(--thyroid_line);\n    border-radius: 14px;\n    display: flex;\n    flex-direction: column;\n    min-height: 100%;\n    padding: 18px;\n  }\n\n  .thyroid_review_card_top {\n    align-items: center;\n    display: flex;\n    gap: 14px;\n    margin-bottom: 15px;\n  }\n\n  .thyroid_review_avatar {\n    aspect-ratio: 1 \/ 1 !important;\n    background-color: var(--thyroid_cream) !important;\n    background-repeat: no-repeat !important;\n    border: 1px solid var(--thyroid_line) !important;\n    border-radius: 999px !important;\n    box-shadow: 0 2px 8px rgba(47, 42, 40, 0.08) !important;\n    display: block !important;\n    flex: 0 0 92px !important;\n    height: 92px !important;\n    max-height: 92px !important;\n    max-width: 92px !important;\n    min-height: 92px !important;\n    min-width: 92px !important;\n    overflow: hidden !important;\n    width: 92px !important;\n  }\n\n  .thyroid_review_avatar_rimas {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/rimas_geiga.png?v=1785071125\") !important;\n    background-position: 50% 18% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_snieguole {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Snieguole_Geige.jpg?v=1785070794\") !important;\n    background-position: 50% 15% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_veronika {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Veronika_Matutyte_Doctor.jpg?v=1785075107\") !important;\n    background-position: 50% 18% !important;\n    background-size: 128% auto !important;\n  }\n\n  .thyroid_review_label {\n    color: var(--thyroid_taupe_dark);\n    display: block;\n    font-size: 11px;\n    font-weight: 700;\n    letter-spacing: 0.08em;\n    margin-bottom: 5px;\n    text-transform: uppercase;\n  }\n\n  .thyroid_review_name {\n    color: var(--thyroid_ink);\n    font-family: Georgia, \"Times New Roman\", serif;\n    font-size: 20px;\n    font-weight: 500;\n    line-height: 1.15;\n    margin: 0 0 5px;\n  }\n\n  .thyroid_review_title {\n    color: var(--thyroid_muted);\n    font-size: 13px;\n    line-height: 1.45;\n    margin: 0;\n  }\n\n  .thyroid_review_scope {\n    font-size: 14px;\n    line-height: 1.6;\n    margin-bottom: 16px;\n  }\n\n  .thyroid_review_link,\n  .thyroid_board_link a,\n  .thyroid_sources a {\n    color: var(--thyroid_taupe_dark);\n    font-weight: 700;\n    text-decoration: underline;\n    text-decoration-thickness: 1px;\n    text-underline-offset: 4px;\n  }\n\n  .thyroid_review_link {\n    font-size: 13px;\n    margin-top: auto;\n  }\n\n  .thyroid_review_meta {\n    background: var(--thyroid_cream);\n    border-radius: 12px;\n    display: grid;\n    gap: 12px;\n    grid-template-columns: repeat(3, minmax(0, 1fr));\n    margin-top: 20px;\n    padding: 17px 18px;\n  }\n\n  .thyroid_review_meta strong {\n    display: block;\n    font-size: 13px;\n    margin-bottom: 3px;\n  }\n\n  .thyroid_review_meta span {\n    color: var(--thyroid_muted);\n    font-size: 13px;\n  }\n\n  .thyroid_board_link {\n    border-top: 1px solid var(--thyroid_line);\n    margin-top: 18px;\n    padding-top: 16px;\n  }\n\n  .thyroid_sources details {\n    border: 1px solid var(--thyroid_line);\n    border-radius: 12px;\n    overflow: hidden;\n  }\n\n  .thyroid_sources summary {\n    align-items: center;\n    background: var(--thyroid_cream);\n    cursor: pointer;\n    display: flex;\n    font-weight: 700;\n    justify-content: space-between;\n    list-style: none;\n    padding: 16px 18px;\n  }\n\n  .thyroid_sources_body { padding: 18px; }\n\n  .thyroid_faq details {\n    border-bottom: 1px solid var(--thyroid_line);\n    padding: 14px 0;\n  }\n\n  .thyroid_faq details:last-child { border-bottom: 0; }\n\n  .thyroid_faq summary {\n    cursor: pointer;\n    font-weight: 700;\n  }\n\n  .thyroid_faq details p { margin-top: 12px; }\n\n  .thyroid_footer_note {\n    background: var(--thyroid_taupe_dark);\n    border-radius: 16px;\n    color: #ffffff;\n    padding: 24px;\n  }\n\n  .thyroid_footer_note h3,\n  .thyroid_footer_note strong { color: #ffffff; }\n\n  @media (max-width: 900px) {\n    .thyroid_grid,\n    .thyroid_method_grid,\n    .thyroid_trust_grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }\n\n    .thyroid_steps,\n    .thyroid_review_grid { grid-template-columns: 1fr; }\n\n    .thyroid_review_meta { grid-template-columns: 1fr; }\n  }\n\n  @media (max-width: 540px) {\n    .thyroid_grid,\n    .thyroid_method_grid,\n    .thyroid_trust_grid { grid-template-columns: 1fr; }\n\n    .thyroid_product { font-size: 15px; }\n\n    .thyroid_biomarker summary {\n      font-size: 16px;\n      padding: 16px;\n    }\n\n    .thyroid_biomarker_body { padding: 18px 15px 21px; }\n\n    .thyroid_review_avatar {\n      flex-basis: 78px !important;\n      height: 78px !important;\n      max-height: 78px !important;\n      max-width: 78px !important;\n      min-height: 78px !important;\n      min-width: 78px !important;\n      width: 78px !important;\n    }\n  }\n\n  .thyroid_review_avatar_laura {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/5W4A9892.jpg?v=1785070092\") !important;\n    background-position: 50% 15% !important;\n    background-size: 132% auto !important;\n  }\n\n  .thyroid_review_avatar_rimas {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/rimas_geiga.png?v=1785071125\") !important;\n    background-position: 50% 18% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_veronika {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Veronika_Matutyte_Doctor.jpg?v=1785075107\") !important;\n    background-position: 50% 18% !important;\n    background-size: 128% auto !important;\n  }\n\n  .thyroid_review_avatar_giedre {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Giedre_Narkiene.png?v=1785071017\") !important;\n    background-position: 50% 18% !important;\n    background-size: 132% auto !important;\n  }\n\n  .thyroid_review_avatar_rimas {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/rimas_geiga.png?v=1785071125\") !important;\n    background-position: 50% 18% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_veronika {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Veronika_Matutyte_Doctor.jpg?v=1785075107\") !important;\n    background-position: 50% 18% !important;\n    background-size: 128% auto !important;\n  }\n\n  .thyroid_review_avatar_rimas {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/rimas_geiga.png?v=1785071125\") !important;\n    background-position: 50% 18% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_veronika {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Veronika_Matutyte_Doctor.jpg?v=1785075107\") !important;\n    background-position: 50% 18% !important;\n    background-size: 128% auto !important;\n  }\n\n  .thyroid_review_avatar_laura {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/5W4A9892.jpg?v=1785070092\") !important;\n    background-position: 50% 15% !important;\n    background-size: 132% auto !important;\n  }\n\n  .thyroid_review_avatar_snieguole {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Snieguole_Geige.jpg?v=1785070794\") !important;\n    background-position: 50% 15% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_rimas {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/rimas_geiga.png?v=1785071125\") !important;\n    background-position: 50% 18% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_veronika {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Veronika_Matutyte_Doctor.jpg?v=1785075107\") !important;\n    background-position: 50% 18% !important;\n    background-size: 128% auto !important;\n  }\n\n  .thyroid_review_avatar_veronika {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Veronika_Matutyte_Doctor.jpg?v=1785075107\") !important;\n    background-position: 50% 18% !important;\n    background-size: 128% auto !important;\n  }\n\n  .thyroid_review_avatar_snieguole {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Snieguole_Geige.jpg?v=1785070794\") !important;\n    background-position: 50% 15% !important;\n    background-size: 118% auto !important;\n  }\n\n  .thyroid_review_avatar_giedre {\n    background-image: url(\"https:\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Giedre_Narkiene.png?v=1785071017\") !important;\n    background-position: 50% 18% !important;\n    background-size: 132% auto !important;\n  }\n\u003c\/style\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003carticle class=\"thyroid_product\"\u003e\n\u003csection class=\"thyroid_hero\"\u003e\n\u003cp class=\"thyroid_eyebrow\"\u003eAt home thyroid function blood test\u003c\/p\u003e\n\u003ch2\u003eHome Thyroid Test Kit UK | TSH, T3 \u0026amp; T4 Blood Test\u003c\/h2\u003e\n\u003cp class=\"thyroid_lead\"\u003e\u003cstrong\u003eA three marker home blood test measuring TSH, free T4 and free T3 through a UK laboratory pathway.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe panel provides information about the pituitary and thyroid hormone feedback system. It may support assessment of underactive or overactive thyroid patterns and treatment monitoring, but it cannot identify every cause or replace clinical diagnosis.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_grid\"\u003e\n\u003cdiv class=\"thyroid_stat\"\u003e\n\u003cstrong\u003e3 biomarkers\u003c\/strong\u003e\u003cspan\u003eTSH, free T4 and free T3\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_stat\"\u003e\n\u003cstrong\u003eHome collection\u003c\/strong\u003e\u003cspan\u003eCapillary blood collected into the supplied microtainer\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_stat\"\u003e\n\u003cstrong\u003eUK laboratory pathway\u003c\/strong\u003e\u003cspan\u003eUKAS accredited and CQC registered laboratory processing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_stat\"\u003e\n\u003cstrong\u003eProduct code\u003c\/strong\u003e\u003cspan\u003eC1BLP02800\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_notice\"\u003e\n\u003cstrong\u003eThyroid function panel, not a complete thyroid investigation\u003c\/strong\u003e\n\u003cp\u003eThis product does not include thyroid peroxidase antibodies, thyroglobulin antibodies, TSH receptor antibodies, reverse T3, thyroid ultrasound or examination of a neck lump.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_warning\"\u003e\n\u003cstrong\u003eUrgent symptoms should not wait for a home test\u003c\/strong\u003e\n\u003cp\u003eSeek urgent help for chest pain, severe breathlessness, collapse, a very fast or irregular heartbeat, confusion, fever with severe agitation, or new neck swelling that affects breathing or swallowing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003cp class=\"thyroid_eyebrow\"\u003eQuality and compliance\u003c\/p\u003e\n\u003ch3\u003eHome thyroid testing supported by UK standards\u003c\/h3\u003e\n\u003cdiv class=\"thyroid_trust_grid\"\u003e\n\u003cdiv class=\"thyroid_trust_item\"\u003e\n\u003cstrong\u003eUKAS accredited laboratories\u003c\/strong\u003e \u003cspan\u003eISO 15189 accreditation supports laboratory competence, quality systems and diagnostic performance.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_trust_item\"\u003e\n\u003cstrong\u003eCQC registered services\u003c\/strong\u003e \u003cspan\u003eThe diagnostic pathway uses organisations registered with the Care Quality Commission.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_trust_item\"\u003e\n\u003cstrong\u003eCompliant collection equipment\u003c\/strong\u003e \u003cspan\u003eUKCA and CE marked equipment supported by an ISO 13485 quality management framework.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_trust_item\"\u003e\n\u003cstrong\u003eClinically bounded claims\u003c\/strong\u003e \u003cspan\u003eMedicine timing, pregnancy, illness, biotin interference and urgent symptom limits are made explicit.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003eWhat this thyroid function panel measures\u003c\/h3\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eMarker\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eRole\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eClinical context\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTSH\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePituitary signal controlling thyroid hormone production\u003c\/td\u003e\n\u003ctd\u003eThe usual first marker for suspected primary thyroid dysfunction.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree T4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnbound circulating thyroxine\u003c\/td\u003e\n\u003ctd\u003eHelps distinguish overt and subclinical patterns and assess treatment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFree T3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUnbound circulating triiodothyronine\u003c\/td\u003e\n\u003ctd\u003eParticularly useful where TSH is low or hyperthyroidism is suspected.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003eWho may consider this test?\u003c\/h3\u003e\n\u003cp\u003eThis home thyroid test kit may be considered by adults seeking selected thyroid hormone information in the context of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePersistent tiredness, feeling cold, constipation or unexplained weight change\u003c\/li\u003e\n\u003cli\u003ePalpitations, tremor, heat intolerance, sweating or unexplained weight loss\u003c\/li\u003e\n\u003cli\u003eHair, skin or menstrual changes alongside clinical assessment\u003c\/li\u003e\n\u003cli\u003eA family or personal history of thyroid disease\u003c\/li\u003e\n\u003cli\u003eAn earlier abnormal or borderline thyroid result\u003c\/li\u003e\n\u003cli\u003eClinician directed monitoring of levothyroxine, liothyronine or antithyroid treatment\u003c\/li\u003e\n\u003cli\u003ePregnancy planning or pregnancy where clinical guidance has already been arranged\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese symptoms are non specific and can have many causes not measured by this panel.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003eCommon thyroid function patterns\u003c\/h3\u003e\n\u003cp\u003eThese patterns support interpretation but do not establish the underlying cause.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eTSH\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eFree T4 or free T3 pattern\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePossible interpretation\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow free T4\u003c\/td\u003e\n\u003ctd\u003eCommonly supports overt primary hypothyroidism.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNormal free T4\u003c\/td\u003e\n\u003ctd\u003eMay indicate subclinical hypothyroidism and often requires repeat testing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHigh free T4 or free T3\u003c\/td\u003e\n\u003ctd\u003eMay support hyperthyroidism or excessive thyroid hormone treatment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eNormal free T4 and free T3\u003c\/td\u003e\n\u003ctd\u003eMay indicate subclinical hyperthyroidism, medicine effects, pregnancy or illness.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow or normal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eLow free T4\u003c\/td\u003e\n\u003ctd\u003eMay suggest central hypothyroidism, severe illness, medicine effects or assay interference.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDiscordant\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eResults do not fit a usual pattern\u003c\/td\u003e\n\u003ctd\u003eConsider medicine timing, biotin, pregnancy, illness, analytical interference or uncommon pituitary conditions.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003eHow the home thyroid test kit works\u003c\/h3\u003e\n\u003cdiv class=\"thyroid_steps\"\u003e\n\u003cdiv class=\"thyroid_step\"\u003e\n\u003cspan class=\"thyroid_step_number\"\u003e1\u003c\/span\u003e\n\u003ch4\u003eReview preparation\u003c\/h4\u003e\n\u003cp\u003eRecord medicines, supplements, recent illness, pregnancy status and thyroid treatment timing.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_step\"\u003e\n\u003cspan class=\"thyroid_step_number\"\u003e2\u003c\/span\u003e\n\u003ch4\u003eCollect and return\u003c\/h4\u003e\n\u003cp\u003eCollect capillary blood into the supplied microtainer and return it using the provided packaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_step\"\u003e\n\u003cspan class=\"thyroid_step_number\"\u003e3\u003c\/span\u003e\n\u003ch4\u003eReview the complete pattern\u003c\/h4\u003e\n\u003cp\u003eInterpret TSH, free T4 and free T3 together with symptoms and the laboratory reference intervals.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003ePreparing for the test\u003c\/h3\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003ePreparation\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFasting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFasting is not usually required for this panel. Follow the supplied kit instructions.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThyroid medicines\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eContinue prescribed treatment unless advised otherwise. Record the product, dose and time of the most recent dose.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBiotin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBiotin is vitamin B7 and can interfere with some thyroid assays. Ask the laboratory or a clinician whether it should be paused.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther medicines\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRecord amiodarone, lithium, glucocorticoids, anticonvulsants, oestrogen, fertility treatment and antithyroid medicines.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecent illness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAcute illness may temporarily alter thyroid results. Delay non urgent routine testing until recovered where practical.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePregnancy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRecord pregnancy, trimester and recent birth because specialist reference intervals and follow up may be required.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRepeat comparisons\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eUse similar collection timing and medicine timing when comparing results over time.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003eBiomarkers and result interpretation\u003c\/h3\u003e\n\u003cp\u003eSelect each marker to read what it measures, preparation guidance and how low, normal, high or urgent results may be considered.\u003c\/p\u003e\n\u003cdetails class=\"thyroid_biomarker\"\u003e\n\u003csummary\u003eFree triiodothyronine (free T3)\u003c\/summary\u003e\n\u003cdiv class=\"thyroid_biomarker_body\"\u003e\n\u003cp\u003eFree T3 is the unbound fraction of triiodothyronine in the blood. T3 is the more biologically active thyroid hormone, and much of it is produced outside the thyroid through conversion from T4.\u003c\/p\u003e\n\u003cp\u003eFree T3 is particularly useful when TSH is suppressed and hyperthyroidism is suspected. A low free T3 result by itself is not a reliable diagnosis of hypothyroidism because illness, calorie restriction and medicines can lower T3.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_subnote\"\u003e\n\u003cstrong\u003eImportant limitation\u003c\/strong\u003e\n\u003cp\u003eFree T3 is not usually the main marker for diagnosing or monitoring primary hypothyroidism. TSH and free T4 are generally more informative.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eFasting is not usually required. Record levothyroxine, liothyronine, antithyroid medicines, amiodarone, lithium, glucocorticoids, anticonvulsants, oestrogen treatment, pregnancy status, high dose biotin and the timing of the most recent thyroid medicine dose. Do not stop prescribed treatment yourself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_critical\"\u003eCritical low\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA very low result may occur during severe illness, advanced hypothyroidism, medicine effects or analytical problems.\u003c\/td\u003e\n\u003ctd\u003eFollow the laboratory escalation advice and arrange prompt clinical review.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_low\"\u003eLow\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMay occur with non thyroidal illness, calorie restriction, medicines, hypothyroid patterns or treatment factors.\u003c\/td\u003e\n\u003ctd\u003eInterpret with TSH, free T4, symptoms and recent illness.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eFalls within the laboratory interval.\u003c\/td\u003e\n\u003ctd\u003eA normal free T3 does not exclude early hypothyroidism, structural thyroid disease or autoimmune thyroid disease.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMay occur with hyperthyroidism, T3 predominant thyrotoxicosis or liothyronine treatment.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the result with a GP and review TSH, free T4, medicines and symptoms.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_critical\"\u003eCritical high\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA markedly raised result with severe symptoms may indicate significant thyrotoxicosis.\u003c\/td\u003e\n\u003ctd\u003eSeek urgent clinical assessment, especially with a fast heartbeat, chest pain, breathlessness, fever, agitation or confusion.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"thyroid_biomarker\"\u003e\n\u003csummary\u003eThyroid stimulating hormone (TSH)\u003c\/summary\u003e\n\u003cdiv class=\"thyroid_biomarker_body\"\u003e\n\u003cp\u003eTSH is produced by the pituitary gland and signals the thyroid to produce thyroid hormones. It is usually the first laboratory marker used when primary thyroid dysfunction is suspected.\u003c\/p\u003e\n\u003cp\u003eTSH must be interpreted with free T4 and, when TSH is low or hyperthyroidism is suspected, free T3. Pregnancy, medicines, illness and pituitary conditions can alter the pattern.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eFasting is not usually required. Record levothyroxine, liothyronine, antithyroid medicines, amiodarone, lithium, glucocorticoids, anticonvulsants, oestrogen treatment, pregnancy status, high dose biotin and the timing of the most recent thyroid medicine dose. Do not stop prescribed treatment yourself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_critical\"\u003eCritical low\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA markedly suppressed TSH may occur with overt hyperthyroidism, excessive thyroid hormone treatment, pregnancy, severe illness or medicine effects.\u003c\/td\u003e\n\u003ctd\u003eArrange prompt clinical review, particularly when free T4 or free T3 is raised.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_low\"\u003eLow\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eMay occur with hyperthyroidism, subclinical hyperthyroidism, thyroid hormone treatment, pregnancy, illness, medicines or pituitary dysfunction.\u003c\/td\u003e\n\u003ctd\u003eReview free T4, free T3, symptoms and treatment timing.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eFalls within the laboratory reference interval.\u003c\/td\u003e\n\u003ctd\u003eA normal TSH reduces the likelihood of primary overt thyroid dysfunction but does not assess nodules, antibodies or every pituitary condition.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eCommonly occurs when the thyroid is underactive, especially when free T4 is low. It may also reflect medicine timing, adherence, recovery from illness or pregnancy requirements.\u003c\/td\u003e\n\u003ctd\u003eDiscuss repeat testing, symptoms, free T4 and treatment with a GP.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_critical\"\u003eCritical high\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA markedly raised TSH may indicate significant untreated hypothyroidism or inadequate replacement, although interpretation depends on free T4 and clinical status.\u003c\/td\u003e\n\u003ctd\u003eArrange prompt medical review and follow the laboratory escalation advice.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"thyroid_biomarker\"\u003e\n\u003csummary\u003eFree thyroxine (free T4)\u003c\/summary\u003e\n\u003cdiv class=\"thyroid_biomarker_body\"\u003e\n\u003cp\u003eFree T4 is the unbound fraction of thyroxine circulating in the blood. T4 is produced mainly by the thyroid and can be converted into the more active hormone T3 in tissues.\u003c\/p\u003e\n\u003cp\u003eFree T4 helps distinguish overt from subclinical thyroid dysfunction and is important when TSH is abnormal, pituitary disease is suspected, pregnancy is present or thyroid treatment is being monitored.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eFasting is not usually required. Record levothyroxine, liothyronine, antithyroid medicines, amiodarone, lithium, glucocorticoids, anticonvulsants, oestrogen treatment, pregnancy status, high dose biotin and the timing of the most recent thyroid medicine dose. Do not stop prescribed treatment yourself.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_critical\"\u003eCritical low\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA very low result may occur with significant primary hypothyroidism, central hypothyroidism, severe illness or treatment effects.\u003c\/td\u003e\n\u003ctd\u003eArrange prompt clinical review, especially with drowsiness, confusion, hypothermia, severe weakness or breathing problems.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_low\"\u003eLow\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWith high TSH, this commonly supports primary hypothyroidism. With low or normal TSH, central hypothyroidism, illness, medicine effects or assay issues may need consideration.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the complete pattern with a GP and do not adjust treatment alone.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eFalls within the laboratory interval.\u003c\/td\u003e\n\u003ctd\u003eInterpret with TSH, symptoms, treatment, pregnancy status and previous results.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eWith low TSH, this may support hyperthyroidism or excessive thyroid hormone treatment. Discordant patterns can arise from medicines, biotin, pregnancy or assay interference.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the pattern and medicine timing with a clinician.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"thyroid_status thyroid_critical\"\u003eCritical high\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA markedly raised result with severe symptoms may indicate significant thyrotoxicosis.\u003c\/td\u003e\n\u003ctd\u003eSeek urgent clinical assessment, particularly with chest pain, a very fast heartbeat, severe breathlessness, fever, agitation or confusion.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section\"\u003e\n\u003ch3\u003eWhat this test does not include\u003c\/h3\u003e\n\u003cdiv class=\"thyroid_table_wrap\"\u003e\n\u003ctable class=\"thyroid_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eNot included\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhy it may matter\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThyroid peroxidase antibodies\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMay support assessment of Hashimoto's thyroiditis and future hypothyroidism risk.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTSH receptor antibodies\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMay support investigation of Graves' disease.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThyroglobulin antibodies\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMay be used in selected autoimmune or thyroid cancer monitoring contexts.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThyroid ultrasound\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRequired to assess nodules, enlargement and structural thyroid changes.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePituitary hormone testing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMay be required where free T4 is low despite a low or normal TSH.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eClinical examination\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eImportant where there is a neck lump, swelling, swallowing difficulty, eye symptoms or marked heart rate changes.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"content-standards\" class=\"thyroid_section\"\u003e\n\u003cp class=\"thyroid_eyebrow\"\u003eEvidence and content standards\u003c\/p\u003e\n\u003ch3\u003eHow this product information was prepared\u003c\/h3\u003e\n\u003cp\u003eThis page was prepared from the supplied three marker thyroid function test specification and checked against current NICE, NHS, MHRA, UKAS and CQC information on TSH, free T4, free T3, biotin interference, acute illness, pregnancy and treatment monitoring.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_method_grid\"\u003e\n\u003cdiv class=\"thyroid_method_item\"\u003e\n\u003cstrong\u003eProduct specification checked\u003c\/strong\u003e \u003cspan\u003eAt home format, capillary specimen, three biomarkers, preparation guidance and product code.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_method_item\"\u003e\n\u003cstrong\u003eUK clinical evidence checked\u003c\/strong\u003e \u003cspan\u003eNICE and NHS sources used for test selection, result patterns, medicines and clinical limitations.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_method_item\"\u003e\n\u003cstrong\u003eErrors corrected\u003c\/strong\u003e \u003cspan\u003eBiotin is identified correctly as vitamin B7, and free T3 is not presented as a standalone hypothyroidism diagnosis.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_method_item\"\u003e\n\u003cstrong\u003eReview cycle\u003c\/strong\u003e \u003cspan\u003eReview at least annually and earlier when thyroid guidance, laboratory methods or medicine safety advice changes.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"medical-review\" class=\"thyroid_section\"\u003e\n\u003cp class=\"thyroid_eyebrow\"\u003eClinical accountability\u003c\/p\u003e\n\u003ch3\u003eDiagnostic logic, patient safety and symptom context review\u003c\/h3\u003e\n\u003cp\u003eThe review roles are separated across thyroid test logic, patient safety and clinically relevant skin and hair manifestations. The reviewers are not presented as consultant endocrinologists.\u003c\/p\u003e\n\u003cdiv class=\"thyroid_review_grid\"\u003e\n\u003carticle class=\"thyroid_review_card\"\u003e\n\u003cdiv class=\"thyroid_review_card_top\"\u003e\n\u003cdiv role=\"img\" class=\"thyroid_review_avatar thyroid_review_avatar_veronika\" aria-label=\"Portrait of Veronika Matutyte\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"thyroid_review_label\"\u003eDiagnostic logic and laboratory pathway reviewed by\u003c\/span\u003e\n\u003ch4 class=\"thyroid_review_name\"\u003eVeronika Matutyte\u003c\/h4\u003e\n\u003cp class=\"thyroid_review_title\"\u003eMedical Doctor and Healthcare Management Expert\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"thyroid_review_scope\"\u003eReviewed TSH, free T4 and free T3 pattern logic, biotin interference, pregnancy safeguards, repeat testing and laboratory governance.\u003c\/p\u003e\n\u003ca href=\"\/pages\/veronika-matutyte-medical-doctor-and-healthcare-management-expert\" class=\"thyroid_review_link\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003carticle class=\"thyroid_review_card\"\u003e\n\u003cdiv class=\"thyroid_review_card_top\"\u003e\n\u003cdiv role=\"img\" class=\"thyroid_review_avatar thyroid_review_avatar_snieguole\" aria-label=\"Portrait of Dr Snieguole Geige\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"thyroid_review_label\"\u003eMedical safety and treatment limitations reviewed by\u003c\/span\u003e\n\u003ch4 class=\"thyroid_review_name\"\u003eDr Snieguole Geige\u003c\/h4\u003e\n\u003cp class=\"thyroid_review_title\"\u003eDentist, Medical Doctor and Senior Adviser\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"thyroid_review_scope\"\u003eReviewed urgent symptom guidance, medicine continuity, monitoring boundaries and the distinction between home testing and diagnosis.\u003c\/p\u003e\n\u003ca href=\"\/pages\/dr-snieguole-geige-dentist-medical-doctor-and-senior-adviser\" class=\"thyroid_review_link\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003carticle class=\"thyroid_review_card\"\u003e\n\u003cdiv class=\"thyroid_review_card_top\"\u003e\n\u003cdiv role=\"img\" class=\"thyroid_review_avatar thyroid_review_avatar_giedre\" aria-label=\"Portrait of Dr Giedre Narkiene\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"thyroid_review_label\"\u003eSkin, hair and patient symptom context reviewed by\u003c\/span\u003e\n\u003ch4 class=\"thyroid_review_name\"\u003eDr Giedre Narkiene\u003c\/h4\u003e\n\u003cp class=\"thyroid_review_title\"\u003eMedical Doctor and Board Certified Dermatologist\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"thyroid_review_scope\"\u003eReviewed responsible discussion of hair, skin and nail changes, symptom non specificity and the need for wider clinical assessment.\u003c\/p\u003e\n\u003ca href=\"\/pages\/dr-giedre-narkiene-medical-doctor-and-board-certified-dermatologist\" class=\"thyroid_review_link\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"thyroid_review_meta\"\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEvidence checked\u003c\/strong\u003e \u003cspan\u003e26 July 2026\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eClinical review date\u003c\/strong\u003e \u003cspan\u003e26 July 2026\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eNext scheduled review\u003c\/strong\u003e \u003cspan\u003eBy 26 July 2027 or earlier when UK guidance changes\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"thyroid_board_link\"\u003e\u003ca href=\"\/pages\/medical-advisory-board\"\u003eMeet the Grace Belgravia Medical Advisory Board\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section thyroid_sources\"\u003e\n\u003cp class=\"thyroid_eyebrow\"\u003eAuthoritative references\u003c\/p\u003e\n\u003ch3\u003eUK thyroid testing and laboratory sources\u003c\/h3\u003e\n\u003cdetails\u003e\n\u003csummary\u003eView the evidence sources used\u003c\/summary\u003e\n\u003cdiv class=\"thyroid_sources_body\"\u003e\n\u003cul\u003e\n\u003cli\u003eNICE guideline NG145: Thyroid disease, assessment and management\u003c\/li\u003e\n\u003cli\u003eNICE Clinical Knowledge Summaries: hypothyroidism and hyperthyroidism assessment\u003c\/li\u003e\n\u003cli\u003eGloucestershire Hospitals NHS: thyroid function tests, TSH, free T4 and free T3\u003c\/li\u003e\n\u003cli\u003eNHS information on underactive and overactive thyroid conditions\u003c\/li\u003e\n\u003cli\u003eMHRA safety guidance on biotin interference with thyroid laboratory tests\u003c\/li\u003e\n\u003cli\u003eUKAS ISO 15189 medical laboratory accreditation information\u003c\/li\u003e\n\u003cli\u003eCQC guidance on diagnostic and screening procedures\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_section thyroid_faq\"\u003e\n\u003cp class=\"thyroid_eyebrow\"\u003eSearch led questions\u003c\/p\u003e\n\u003ch3\u003eHome thyroid test kit FAQs\u003c\/h3\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I take a thyroid blood test at home?\u003c\/summary\u003e\n\u003cp\u003eYes. This kit uses capillary blood collected at home and returned for laboratory analysis. It measures TSH, free T4 and free T3, but the result must be interpreted with symptoms, medicines, pregnancy status, recent illness and previous results.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does a thyroid function test measure?\u003c\/summary\u003e\n\u003cp\u003eThis panel measures thyroid stimulating hormone, free thyroxine and free triiodothyronine. Together they provide information about the pituitary and thyroid hormone feedback system.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eIs TSH enough to check thyroid function?\u003c\/summary\u003e\n\u003cp\u003eTSH is the usual first test for suspected primary thyroid dysfunction. Free T4 is particularly important when TSH is high, while free T4 and free T3 are useful when TSH is low or hyperthyroidism is suspected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this test diagnose an underactive thyroid?\u003c\/summary\u003e\n\u003cp\u003eNo single home result should be treated as a diagnosis. A high TSH with low free T4 commonly supports primary hypothyroidism, while a high TSH with normal free T4 may indicate subclinical hypothyroidism and often requires repeat testing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this test diagnose an overactive thyroid?\u003c\/summary\u003e\n\u003cp\u003eA low TSH with raised free T4 or free T3 may support hyperthyroidism or thyrotoxicosis, but the cause requires clinical assessment and may involve antibody testing, examination, imaging or other investigations.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to fast for a thyroid blood test?\u003c\/summary\u003e\n\u003cp\u003eFasting is not usually required for TSH, free T4 or free T3 alone. Follow the kit instructions and use similar collection conditions when comparing results over time.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the best time to take a thyroid test?\u003c\/summary\u003e\n\u003cp\u003eThyroid tests can usually be collected at a convenient time, but consistency matters for monitoring. If you take levothyroxine or liothyronine, record the dose and time taken because recent dosing can affect free hormone results.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I take levothyroxine before the blood test?\u003c\/summary\u003e\n\u003cp\u003eContinue prescribed treatment unless your clinician gives different instructions. Record when the dose was taken. Some clinicians prefer testing before the morning dose or under the same timing conditions for each repeat result.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan liothyronine affect free T3 results?\u003c\/summary\u003e\n\u003cp\u003eYes. Free T3 may rise after a liothyronine dose, so the collection time in relation to the dose is important. Follow the prescribing clinician's requested timing and do not stop treatment yourself.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan biotin affect thyroid blood test results?\u003c\/summary\u003e\n\u003cp\u003eYes. High biotin intake from supplements can cause falsely high or falsely low thyroid results in some laboratory methods. Biotin is vitamin B7, not vitamin B9. Ask the laboratory or a clinician whether it should be paused.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I delay thyroid testing after an illness?\u003c\/summary\u003e\n\u003cp\u003eAcute illness can temporarily alter thyroid results, sometimes called non thyroidal illness. Routine testing may be delayed until recovery unless thyroid dysfunction is suspected as part of the acute illness or urgent clinical assessment is needed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan pregnancy affect thyroid test results?\u003c\/summary\u003e\n\u003cp\u003eYes. Pregnancy changes thyroid physiology and requires trimester and laboratory specific reference intervals. People who are pregnant, trying to conceive or recently postpartum should discuss results promptly with their GP, midwife or specialist.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does a high TSH result mean?\u003c\/summary\u003e\n\u003cp\u003eA high TSH commonly occurs when the thyroid is underactive, particularly when free T4 is low. It can also be influenced by medicine adherence or timing, recovery from illness, pregnancy requirements and less common pituitary or assay factors.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does a low TSH result mean?\u003c\/summary\u003e\n\u003cp\u003eA low TSH may occur with an overactive thyroid, excessive thyroid hormone treatment, pregnancy, acute illness, medicines or pituitary conditions. Free T4 and free T3 help interpret the pattern.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does a low free T4 result mean?\u003c\/summary\u003e\n\u003cp\u003eLow free T4 with high TSH commonly supports primary hypothyroidism. Low free T4 with a low or normal TSH can suggest central hypothyroidism, severe illness, medicine effects or assay interference and needs clinical review.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does a high free T4 result mean?\u003c\/summary\u003e\n\u003cp\u003eHigh free T4 with low TSH may support hyperthyroidism or excessive thyroid hormone treatment. A discordant pattern can occur with medicines, biotin, assay interference, pregnancy or rare pituitary conditions.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does free T3 add to the panel?\u003c\/summary\u003e\n\u003cp\u003eFree T3 can help when hyperthyroidism is suspected because some people have raised T3 before free T4 rises. A low free T3 alone is not a reliable diagnosis of hypothyroidism and commonly occurs during illness.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan normal thyroid results rule out every thyroid problem?\u003c\/summary\u003e\n\u003cp\u003eNo. Normal results reduce the likelihood of overt thyroid dysfunction but do not assess thyroid nodules, structural disease, thyroid cancer or every autoimmune condition. Persistent symptoms still require clinical assessment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this test check for Hashimoto's disease?\u003c\/summary\u003e\n\u003cp\u003eNo. The panel does not include thyroid peroxidase or thyroglobulin antibodies. Antibody testing may be requested where autoimmune thyroid disease is suspected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this test check for Graves' disease?\u003c\/summary\u003e\n\u003cp\u003eNo. TSH, free T4 and free T3 can show a hyperthyroid pattern, but Graves' disease may require TSH receptor antibody testing and clinical assessment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan this test monitor thyroid medication?\u003c\/summary\u003e\n\u003cp\u003eIt may provide useful information, but monitoring depends on the medicine, dose, treatment duration, symptoms, pregnancy status and collection timing. Dose changes should be made only by the prescribing clinician.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow often should thyroid function be tested?\u003c\/summary\u003e\n\u003cp\u003eThe interval depends on the clinical question. After a medicine change, clinicians often wait several weeks before retesting. Stable treated hypothyroidism is commonly monitored periodically, often annually, unless symptoms or circumstances change.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen are thyroid symptoms urgent?\u003c\/summary\u003e\n\u003cp\u003eSeek urgent help for chest pain, severe breathlessness, collapse, a very fast or irregular heartbeat, confusion, fever with severe agitation, or new neck swelling that affects breathing or swallowing.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the laboratories UKAS accredited and CQC registered?\u003c\/summary\u003e\n\u003cp\u003eSamples are processed through UKAS accredited laboratories within a CQC registered diagnostic pathway. Collection equipment is UKCA and CE marked and supported by an ISO 13485 quality management framework.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"thyroid_footer_note\"\u003e\n\u003ch3\u003eMedical guidance\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eThis panel provides thyroid function information and is not a standalone diagnosis.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSeek urgent help for chest pain, severe breathlessness, collapse, a very fast or irregular heartbeat, confusion, fever with severe agitation, or new neck swelling that affects breathing or swallowing.\u003c\/p\u003e\n\u003cp\u003eContinue prescribed thyroid medicine unless a clinician advises otherwise. Do not change levothyroxine, liothyronine or antithyroid treatment from a home result alone.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/article\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":54410153263443,"sku":"479-thyroid-function-tes","price":89.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Home_Thyroid_Test_Kit_UK_-_TSH_T3_T4_Blood_Test.png?v=1785167812"},{"product_id":"advanced-thyroid-hormones","title":"Home Advanced Thyroid Test Kit UK - Hormones \u0026 Antibodies","description":"\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e \u003cmeta content=\"width=device-width, initial-scale=1\" name=\"viewport\"\u003e\u003cmeta content=\"Order a home thyroid test kit in the UK, processed by UKAS accredited and CQC registered labs. 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}\n\n    .th_review_avatar {\n      flex-basis: 78px !important;\n      height: 78px !important;\n      max-height: 78px !important;\n      max-width: 78px !important;\n      min-height: 78px !important;\n      min-width: 78px !important;\n      width: 78px !important;\n    }\n  }\n\u003c\/style\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003carticle class=\"th_product\"\u003e\n\u003csection class=\"th_hero\"\u003e\n\u003cp class=\"th_eyebrow\"\u003eAt home advanced thyroid blood test\u003c\/p\u003e\n\u003ch2\u003eHome Advanced Thyroid Test Kit UK | Hormones \u0026amp; Antibodies\u003c\/h2\u003e\n\u003cp class=\"th_lead\"\u003e\u003cstrong\u003eA 5 biomarker home thyroid test measuring TSH, free T4, free T3, TPO antibodies and thyroglobulin antibodies.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe panel combines thyroid hormone measurements with selected autoimmune thyroid markers. It can provide information about underactive or overactive thyroid patterns and whether thyroid autoimmunity may be contributing.\u003c\/p\u003e\n\u003cdiv class=\"th_grid\"\u003e\n\u003cdiv class=\"th_stat\"\u003e\n\u003cstrong\u003e5 biomarkers\u003c\/strong\u003e\u003cspan\u003eTSH, FT4, FT3, TPO antibodies and thyroglobulin antibodies\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_stat\"\u003e\n\u003cstrong\u003eHome collection\u003c\/strong\u003e\u003cspan\u003eCapillary blood collected into the supplied microtainer\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_stat\"\u003e\n\u003cstrong\u003eUK laboratory pathway\u003c\/strong\u003e\u003cspan\u003eUKAS accredited and CQC registered laboratory processing\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_stat\"\u003e\n\u003cstrong\u003eProduct code\u003c\/strong\u003e\u003cspan\u003eC1BLP13700\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_notice\"\u003e\n\u003cstrong\u003eImportant limitation\u003c\/strong\u003e\n\u003cp\u003eThis test may identify a thyroid hormone pattern or thyroid antibodies, but it does not replace a clinical diagnosis. It does not include TSH receptor antibodies, ultrasound imaging, examination of a thyroid lump or testing for thyroid cancer.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_warning\"\u003e\n\u003cstrong\u003eDo not stop thyroid medicine\u003c\/strong\u003e\n\u003cp\u003eContinue prescribed thyroid treatment unless the clinician responsible for your care advises otherwise. Tell the testing service exactly what you take and when the last dose was taken.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003cp class=\"th_eyebrow\"\u003eQuality and compliance\u003c\/p\u003e\n\u003ch3\u003eHome testing supported by UK clinical standards\u003c\/h3\u003e\n\u003cdiv class=\"th_trust_grid\"\u003e\n\u003cdiv class=\"th_trust_item\"\u003e\n\u003cstrong\u003eUKAS accredited laboratories\u003c\/strong\u003e \u003cspan\u003eMedical laboratory accreditation assesses quality, competence and diagnostic performance.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_trust_item\"\u003e\n\u003cstrong\u003eCQC registered services\u003c\/strong\u003e \u003cspan\u003eThe diagnostic pathway uses organisations registered with the Care Quality Commission.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_trust_item\"\u003e\n\u003cstrong\u003eCompliant collection equipment\u003c\/strong\u003e \u003cspan\u003eUKCA and CE marked equipment supported by an ISO 13485 quality management framework.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_trust_item\"\u003e\n\u003cstrong\u003eSecure results\u003c\/strong\u003e \u003cspan\u003eClear collection guidance, order updates, secure result delivery and escalation support where needed.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003ch3\u003eWhat this advanced thyroid test measures\u003c\/h3\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eHealth area\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eBiomarkers\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat they may help show\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePituitary thyroid signal\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTSH\u003c\/td\u003e\n\u003ctd\u003eThe signal from the pituitary gland that regulates thyroid hormone production.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCirculating thyroid hormones\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFree T4 and free T3\u003c\/td\u003e\n\u003ctd\u003eThe unbound thyroid hormones available to tissues.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eAutoimmune thyroid context\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eTPO antibodies and thyroglobulin antibodies\u003c\/td\u003e\n\u003ctd\u003eEvidence that the immune system is producing antibodies associated with autoimmune thyroid disease.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003ch3\u003eWho may consider this test?\u003c\/h3\u003e\n\u003cp\u003eThis panel may be considered by adults who want to review selected thyroid markers in the context of:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePersistent tiredness or feeling unusually cold\u003c\/li\u003e\n\u003cli\u003eUnexplained weight change\u003c\/li\u003e\n\u003cli\u003ePalpitations, tremor, sweating or heat intolerance\u003c\/li\u003e\n\u003cli\u003eDry skin, hair changes or constipation\u003c\/li\u003e\n\u003cli\u003eIrregular or heavy periods\u003c\/li\u003e\n\u003cli\u003eA personal or family history of thyroid or autoimmune disease\u003c\/li\u003e\n\u003cli\u003eAn earlier abnormal TSH, free T4 or free T3 result\u003c\/li\u003e\n\u003cli\u003eThyroid treatment monitoring requested by a clinician\u003c\/li\u003e\n\u003cli\u003eClarifying whether an abnormal thyroid pattern may have an autoimmune cause\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThese symptoms are not specific to thyroid disease. A normal panel does not exclude other medical causes.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003ch3\u003eHow thyroid result patterns are considered\u003c\/h3\u003e\n\u003cp\u003eThe individual reference intervals on the laboratory report take priority. The examples below are simplified patterns and not diagnoses.\u003c\/p\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eCommon pattern\u003c\/th\u003e\n\u003cth scope=\"col\"\u003ePossible context\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eImportant qualification\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh TSH with low FT4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA pattern commonly seen with primary hypothyroidism.\u003c\/td\u003e\n\u003ctd\u003eMedicines, recent illness and clinical history still matter.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eHigh TSH with normal FT4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMay be described as subclinical hypothyroidism when persistent.\u003c\/td\u003e\n\u003ctd\u003eA repeat test and TPO antibodies may help guide assessment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow TSH with high FT4 or FT3\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eA pattern commonly seen with hyperthyroidism or excess thyroid hormone replacement.\u003c\/td\u003e\n\u003ctd\u003eFurther tests may include TSH receptor antibodies or imaging.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eLow or normal TSH with low FT4\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCan occur with severe illness, medicines or less commonly pituitary or hypothalamic disease.\u003c\/td\u003e\n\u003ctd\u003eThis discordant pattern needs clinician review and should not be interpreted as normal.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePositive antibodies with normal hormones\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMay indicate thyroid autoimmunity without current hormone dysfunction.\u003c\/td\u003e\n\u003ctd\u003eAntibody positivity alone does not mean medicine is required.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003ch3\u003eHow the home thyroid test kit works\u003c\/h3\u003e\n\u003cdiv class=\"th_steps\"\u003e\n\u003cdiv class=\"th_step\"\u003e\n\u003cspan class=\"th_step_number\"\u003e1\u003c\/span\u003e\n\u003ch4\u003ePrepare for collection\u003c\/h4\u003e\n\u003cp\u003eReview medicine, supplement, biotin and recent illness guidance before collecting the sample.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_step\"\u003e\n\u003cspan class=\"th_step_number\"\u003e2\u003c\/span\u003e\n\u003ch4\u003eCollect and return\u003c\/h4\u003e\n\u003cp\u003eCollect capillary blood into the microtainer and return it using the supplied packaging.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_step\"\u003e\n\u003cspan class=\"th_step_number\"\u003e3\u003c\/span\u003e\n\u003ch4\u003eReview the complete pattern\u003c\/h4\u003e\n\u003cp\u003eConsider all five markers together and seek medical advice for abnormal, critical or discordant results.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003ch3\u003ePreparing for your thyroid blood test\u003c\/h3\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003ePreparation\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eThyroid medicine\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDo not stop levothyroxine, liothyronine or antithyroid medicine unless the prescribing clinician advises you to do so.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDose timing\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFollow the kit or clinician instructions about when to collect relative to the latest thyroid medicine dose.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eBiotin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eBiotin is vitamin B7. High intake can interfere with some thyroid assays. Ask whether and for how long it should be paused.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOther medicines\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRecord amiodarone, lithium, steroids, anticonvulsants, iodine products and any hormone treatment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRecent illness\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eAcute illness and recovery can alter thyroid results. Follow the recommendation to delay non urgent testing after a recent infection where applicable.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eFasting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eFasting is not normally required for this panel. Follow the specific kit instructions.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePregnancy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePregnancy requires different interpretation and closer medical oversight. Tell your GP promptly if you are pregnant or planning pregnancy.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section\"\u003e\n\u003ch3\u003eBiomarkers and result interpretation\u003c\/h3\u003e\n\u003cp\u003eSelect each marker to read what it measures, preparation guidance and how low, normal, high, positive or negative results may be considered.\u003c\/p\u003e\n\u003cdetails class=\"th_biomarker\"\u003e\n\u003csummary\u003eThyroid stimulating hormone\u003c\/summary\u003e\n\u003cdiv class=\"th_biomarker_body\"\u003e\n\u003cp\u003eThyroid stimulating hormone, known as TSH, is produced by the pituitary gland. It signals the thyroid to produce thyroid hormones.\u003c\/p\u003e\n\u003cp\u003eIn primary thyroid disease, a high TSH commonly accompanies an underactive thyroid, while a low TSH commonly accompanies an overactive thyroid. TSH must be interpreted with free T4, free T3, medicines and symptoms.\u003c\/p\u003e\n\u003cdiv class=\"th_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eDo not stop prescribed thyroid medicine. Tell the provider about levothyroxine, liothyronine, carbimazole, propylthiouracil, amiodarone, lithium, steroids, anticonvulsants, iodine and supplements. Biotin is vitamin B7 and can interfere with some thyroid assays. Follow clinical or laboratory advice about whether it should be paused.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_critical\"\u003eCritical low\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA profoundly suppressed result may occur with significant thyroid overactivity, excessive thyroid hormone replacement, recent treatment or less common pituitary or medical factors.\u003c\/td\u003e\n\u003ctd\u003eArrange prompt medical review and follow any urgent laboratory instruction.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_low\"\u003eLow\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA low result may occur with an overactive thyroid, thyroid hormone medicine, pregnancy, recent illness or some medicines.\u003c\/td\u003e\n\u003ctd\u003eDiscuss it with a GP, particularly when free T4 or free T3 is raised.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eThe result falls within the laboratory reference interval.\u003c\/td\u003e\n\u003ctd\u003eInterpret it with free T4 and free T3. Seek medical advice if symptoms persist.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA high result may occur when the thyroid is underactive or the replacement dose is insufficient. Recovery from illness and some medicines can also affect TSH.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the result with your GP.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_critical\"\u003eCritical high\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA very high result may indicate marked thyroid underactivity, although pituitary causes are much less common than primary thyroid disease.\u003c\/td\u003e\n\u003ctd\u003eArrange prompt medical assessment.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"th_biomarker\"\u003e\n\u003csummary\u003eFree thyroxine\u003c\/summary\u003e\n\u003cdiv class=\"th_biomarker_body\"\u003e\n\u003cp\u003eFree thyroxine, known as free T4 or FT4, measures the unbound portion of thyroxine available to tissues. Thyroxine is the principal hormone released by the thyroid.\u003c\/p\u003e\n\u003cp\u003eFT4 is interpreted with TSH. A low FT4 with high TSH commonly supports primary hypothyroidism, while a high FT4 with low TSH commonly supports hyperthyroidism or excess replacement.\u003c\/p\u003e\n\u003cdiv class=\"th_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eDo not stop prescribed thyroid medicine. Tell the provider about levothyroxine, liothyronine, carbimazole, propylthiouracil, amiodarone, lithium, steroids, anticonvulsants, iodine and supplements. Biotin is vitamin B7 and can interfere with some thyroid assays. Follow clinical or laboratory advice about whether it should be paused.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_critical\"\u003eCritical low\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA critically low result may occur with severe thyroid hormone deficiency, treatment effects or less common pituitary disease.\u003c\/td\u003e\n\u003ctd\u003eSeek urgent medical review, especially with extreme drowsiness, confusion, low temperature or severe weakness.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_low\"\u003eLow\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA low result may occur with an underactive thyroid, insufficient replacement, pituitary disease, severe illness or some medicines.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the result with your GP.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eThe result falls within the laboratory reference interval.\u003c\/td\u003e\n\u003ctd\u003eInterpret it with TSH and symptoms.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA high result may occur with an overactive thyroid, excessive replacement, thyroiditis, pregnancy related changes or assay interference.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the result with your GP promptly.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_critical\"\u003eCritical high\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA critically high result may accompany severe thyrotoxicosis.\u003c\/td\u003e\n\u003ctd\u003eSeek urgent medical review, particularly with rapid heartbeat, fever, agitation, vomiting or confusion.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"th_biomarker\"\u003e\n\u003csummary\u003eFree triiodothyronine\u003c\/summary\u003e\n\u003cdiv class=\"th_biomarker_body\"\u003e\n\u003cp\u003eFree triiodothyronine, known as free T3 or FT3, measures the unbound portion of triiodothyronine available to tissues. T3 is the more biologically active thyroid hormone.\u003c\/p\u003e\n\u003cp\u003eFT3 is especially useful when TSH is low and an overactive thyroid is suspected. A low FT3 can occur during significant non thyroid illness and does not by itself diagnose hypothyroidism.\u003c\/p\u003e\n\u003cdiv class=\"th_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eDo not stop prescribed thyroid medicine. Tell the provider about levothyroxine, liothyronine, carbimazole, propylthiouracil, amiodarone, lithium, steroids, anticonvulsants, iodine and supplements. Biotin is vitamin B7 and can interfere with some thyroid assays. Follow clinical or laboratory advice about whether it should be paused.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_critical\"\u003eCritical low\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA very low result can occur with severe illness, reduced thyroid hormone production, medicine effects or under replacement.\u003c\/td\u003e\n\u003ctd\u003eDiscuss urgently with a clinician when the result is critical or severe symptoms are present.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_low\"\u003eLow\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA low result may occur with an underactive thyroid, severe illness, calorie restriction or medicine effects.\u003c\/td\u003e\n\u003ctd\u003eInterpret with TSH and FT4 rather than in isolation.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eThe result falls within the laboratory reference interval.\u003c\/td\u003e\n\u003ctd\u003eConsider it with TSH, FT4 and symptoms.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA high result may occur with an overactive thyroid, excessive liothyronine or thyroid hormone replacement, thyroiditis or assay interference.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the result promptly with your GP.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_critical\"\u003eCritical high\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA critically high result may accompany severe thyrotoxicosis.\u003c\/td\u003e\n\u003ctd\u003eSeek urgent medical review if accompanied by rapid heartbeat, fever, agitation, breathlessness, vomiting or confusion.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"th_biomarker\"\u003e\n\u003csummary\u003eThyroid peroxidase antibodies\u003c\/summary\u003e\n\u003cdiv class=\"th_biomarker_body\"\u003e\n\u003cp\u003eThyroid peroxidase antibodies, known as TPO antibodies or TPOAb, target an enzyme involved in thyroid hormone production.\u003c\/p\u003e\n\u003cp\u003eRaised TPO antibodies support an autoimmune cause when thyroid function is abnormal, particularly Hashimoto's thyroiditis. They can also be present in some people with normal thyroid hormone results and do not by themselves show current thyroid function.\u003c\/p\u003e\n\u003cdiv class=\"th_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eDo not stop prescribed thyroid medicine. Tell the provider about levothyroxine, liothyronine, carbimazole, propylthiouracil, amiodarone, lithium, steroids, anticonvulsants, iodine and supplements. Biotin is vitamin B7 and can interfere with some thyroid assays. Follow clinical or laboratory advice about whether it should be paused.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNegative\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eNo raised TPO antibody level was detected using the laboratory cut off.\u003c\/td\u003e\n\u003ctd\u003eThis reduces but does not eliminate the possibility of autoimmune thyroid disease.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eThe result is within the laboratory reference interval.\u003c\/td\u003e\n\u003ctd\u003eInterpret it with TSH, free T4, free T3 and symptoms.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003ePositive\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA positive result supports thyroid autoimmunity and is commonly found in Hashimoto's thyroiditis. It can sometimes occur with Graves' disease or in people whose thyroid function remains normal.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the complete thyroid profile with your GP.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA raised result indicates thyroid autoantibodies but the number does not directly measure symptom severity or the degree of thyroid underactivity.\u003c\/td\u003e\n\u003ctd\u003eA medical review is appropriate, but a raised antibody result alone is not normally an emergency.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003cdetails class=\"th_biomarker\"\u003e\n\u003csummary\u003eThyroglobulin antibodies\u003c\/summary\u003e\n\u003cdiv class=\"th_biomarker_body\"\u003e\n\u003cp\u003eThyroglobulin antibodies, known as TgAb, target thyroglobulin, a protein produced within the thyroid and used in thyroid hormone production.\u003c\/p\u003e\n\u003cp\u003eRaised TgAb can occur in autoimmune thyroid disease, particularly Hashimoto's thyroiditis. The result is less specific than a complete clinical assessment and does not show whether thyroid hormone production is currently normal, low or high.\u003c\/p\u003e\n\u003cdiv class=\"th_subnote\"\u003e\n\u003cstrong\u003eBefore testing\u003c\/strong\u003e\n\u003cp\u003eDo not stop prescribed thyroid medicine. Tell the provider about levothyroxine, liothyronine, carbimazole, propylthiouracil, amiodarone, lithium, steroids, anticonvulsants, iodine and supplements. Biotin is vitamin B7 and can interfere with some thyroid assays. Follow clinical or laboratory advice about whether it should be paused.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch4\u003eHow to understand this result\u003c\/h4\u003e\n\u003cdiv class=\"th_table_wrap\"\u003e\n\u003ctable class=\"th_table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth scope=\"col\"\u003eResult\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat it may mean\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eWhat to do\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNegative\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eNo raised thyroglobulin antibody level was detected using the laboratory cut off.\u003c\/td\u003e\n\u003ctd\u003eThis does not exclude every autoimmune or non autoimmune thyroid condition.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_normal\"\u003eNormal\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eThe result is within the laboratory reference interval.\u003c\/td\u003e\n\u003ctd\u003eInterpret it with TPO antibodies and the thyroid hormone profile.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003ePositive\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA positive result may support autoimmune thyroid activity, particularly when other thyroid tests or symptoms are abnormal.\u003c\/td\u003e\n\u003ctd\u003eDiscuss the result with your GP.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cspan class=\"th_status th_high\"\u003eHigh\u003c\/span\u003e\u003c\/td\u003e\n\u003ctd\u003eA raised result indicates measurable thyroglobulin antibodies. The concentration does not by itself establish the severity of thyroid disease.\u003c\/td\u003e\n\u003ctd\u003eReview the full pattern with a clinician rather than treating the antibody result alone.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection id=\"content-standards\" class=\"th_section\"\u003e\n\u003cp class=\"th_eyebrow\"\u003eContent standards\u003c\/p\u003e\n\u003ch3\u003eHow this product information was prepared\u003c\/h3\u003e\n\u003cp\u003eThis page was prepared from the supplied five marker thyroid product specification and expanded using current UK thyroid, laboratory and medicine safety guidance.\u003c\/p\u003e\n\u003cdiv class=\"th_method_grid\"\u003e\n\u003cdiv class=\"th_method_item\"\u003e\n\u003cstrong\u003ePrimary product source\u003c\/strong\u003e \u003cspan\u003eThe supplied biomarkers, medicine guidance, interpretation categories and product code.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_method_item\"\u003e\n\u003cstrong\u003eUK clinical references\u003c\/strong\u003e \u003cspan\u003eNICE, NHS, MHRA and British Thyroid Foundation information used for testing pathways, antibodies and biotin safety.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_method_item\"\u003e\n\u003cstrong\u003eClinical boundaries\u003c\/strong\u003e \u003cspan\u003eThe page distinguishes thyroid hormone patterns and antibody results from a confirmed diagnosis.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_method_item\"\u003e\n\u003cstrong\u003eReview policy\u003c\/strong\u003e \u003cspan\u003eMedical and editorial review at least annually and earlier when the panel, laboratory pathway or UK guidance changes.\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection id=\"medical-review\" class=\"th_section\"\u003e\n\u003cp class=\"th_eyebrow\"\u003eExpert review\u003c\/p\u003e\n\u003ch3\u003eMedical and editorial review\u003c\/h3\u003e\n\u003cp\u003eThis product information has been reviewed for general medical accuracy, thyroid hormone context, antibody limitations, medicine safety and appropriate escalation of abnormal results.\u003c\/p\u003e\n\u003cp\u003eThe review applies to general product information. It is not personal medical advice and does not replace assessment by a GP or endocrinologist.\u003c\/p\u003e\n\u003cdiv class=\"th_review_grid\"\u003e\n\u003carticle class=\"th_review_card\"\u003e\n\u003cdiv class=\"th_review_card_top\"\u003e\n\u003cdiv role=\"img\" class=\"th_review_avatar th_review_avatar_snieguole\" aria-label=\"Portrait of Dr Snieguole Geige\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"th_review_label\"\u003eMedical review\u003c\/span\u003e\n\u003ch4 class=\"th_review_name\"\u003eDr Snieguole Geige\u003c\/h4\u003e\n\u003cp class=\"th_review_title\"\u003eDentist, Medical Doctor and Senior Adviser\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"th_review_scope\"\u003eReviewed the general thyroid health boundaries, autoimmune context, patient communication and guidance on when direct medical assessment is required.\u003c\/p\u003e\n\u003ca href=\"https:\/\/ht10f0-c0.myshopify.com\/pages\/dr-snieguole-geige-dentist-medical-doctor-and-senior-adviser\" class=\"th_review_link\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003carticle class=\"th_review_card\"\u003e\n\u003cdiv class=\"th_review_card_top\"\u003e\n\u003cdiv role=\"img\" class=\"th_review_avatar th_review_avatar_rimas\" aria-label=\"Portrait of Dr Rimas Geiga\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"th_review_label\"\u003eMedical review\u003c\/span\u003e\n\u003ch4 class=\"th_review_name\"\u003eDr Rimas Geiga\u003c\/h4\u003e\n\u003cp class=\"th_review_title\"\u003eMedical Doctor, Nutritional Sciences Adviser and Healthy Ageing Expert\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"th_review_scope\"\u003eReviewed the metabolism, energy, supplement and medicine context, including responsible discussion of biotin and iodine products.\u003c\/p\u003e\n\u003ca href=\"https:\/\/ht10f0-c0.myshopify.com\/pages\/dr-rimas-geiga-medical-doctor-nutritional-sciences-adviser-and-healthy-ageing-expert\" class=\"th_review_link\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003carticle class=\"th_review_card\"\u003e\n\u003cdiv class=\"th_review_card_top\"\u003e\n\u003cdiv role=\"img\" class=\"th_review_avatar th_review_avatar_veronika\" aria-label=\"Portrait of Veronika Matutyte\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cspan class=\"th_review_label\"\u003eClinical and safety review\u003c\/span\u003e\n\u003ch4 class=\"th_review_name\"\u003eVeronika Matutyte\u003c\/h4\u003e\n\u003cp class=\"th_review_title\"\u003eMedical Doctor and Healthcare Management Expert\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"th_review_scope\"\u003eReviewed critical result guidance, medicine cautions, urgent symptoms, clinical limitations and the safety of the home testing pathway.\u003c\/p\u003e\n\u003ca href=\"https:\/\/ht10f0-c0.myshopify.com\/pages\/veronika-matutyte-medical-doctor-and-healthcare-management-expert\" class=\"th_review_link\"\u003eView professional profile\u003c\/a\u003e\u003c\/article\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"th_review_meta\"\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eLast medically reviewed\u003c\/strong\u003e \u003cspan\u003e26 July 2026\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eReview cycle\u003c\/strong\u003e \u003cspan\u003eAt least once each year\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cstrong\u003eEarlier review\u003c\/strong\u003e \u003cspan\u003eWhen laboratory methods, medicine safety advice, biomarkers or thyroid guidance changes\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp class=\"th_board_link\"\u003e\u003ca href=\"https:\/\/ht10f0-c0.myshopify.com\/pages\/medical-advisory-board\"\u003eMeet the Grace Belgravia Medical Advisory Board\u003c\/a\u003e\u003c\/p\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section th_sources\"\u003e\n\u003cp class=\"th_eyebrow\"\u003eFurther reading\u003c\/p\u003e\n\u003ch3\u003eAuthoritative UK thyroid and laboratory information\u003c\/h3\u003e\n\u003cp\u003eThese resources provide additional context. They do not replace the instructions, reference intervals or comments supplied with your individual laboratory report.\u003c\/p\u003e\n\u003cdetails\u003e\n\u003csummary\u003eView NICE, NHS, MHRA and thyroid references\u003c\/summary\u003e\n\u003cdiv class=\"th_sources_body\"\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.nice.org.uk\/guidance\/ng145\/chapter\/recommendations\"\u003eNICE thyroid disease assessment and management\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.nhs.uk\/conditions\/underactive-thyroid-hypothyroidism\/\"\u003eNHS information about underactive thyroid\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.nhs.uk\/conditions\/overactive-thyroid-hyperthyroidism\/\"\u003eNHS information about overactive thyroid\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.btf-thyroid.org\/thyroid-function-testing\"\u003eBritish Thyroid Foundation thyroid function testing\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.btf-thyroid.org\/thyroid-antibodies-explained\"\u003eBritish Thyroid Foundation thyroid antibodies information\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.gov.uk\/drug-device-alerts\/mhra-safety-roundup-may-2025\"\u003eMHRA information about biotin interference\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.ukas.com\/accreditation\/standards\/medical-laboratory-accreditation\/\"\u003eUKAS medical laboratory accreditation\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.cqc.org.uk\/guidance-regulation\/providers\/registration\/scope-registration\/regulated-activities\/diagnostic-and-screening-procedures\"\u003eCQC diagnostic and screening services guidance\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_section th_faq\"\u003e\n\u003cp class=\"th_eyebrow\"\u003eSearch led questions\u003c\/p\u003e\n\u003ch3\u003eHome thyroid test kit FAQs\u003c\/h3\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I test my thyroid at home?\u003c\/summary\u003e\n\u003cp\u003eYes. This kit uses a capillary blood sample collected at home and returned for laboratory analysis. It measures thyroid hormones and two thyroid antibody markers.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does an advanced thyroid blood test check?\u003c\/summary\u003e\n\u003cp\u003eThis panel checks TSH, free T4, free T3, thyroid peroxidase antibodies and thyroglobulin antibodies. It combines thyroid function markers with selected autoimmune thyroid markers.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat is the difference between a basic and advanced thyroid test?\u003c\/summary\u003e\n\u003cp\u003eA basic thyroid panel commonly measures TSH and free T4, sometimes with free T3. This advanced panel also measures TPO antibodies and thyroglobulin antibodies.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDo I need to fast for a thyroid blood test?\u003c\/summary\u003e\n\u003cp\u003eFasting is not usually required for these five markers. Follow the kit instructions and tell the provider about prescribed medicines, vitamins and supplements.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eShould I take levothyroxine before a thyroid blood test?\u003c\/summary\u003e\n\u003cp\u003eDo not stop prescribed thyroid medicine. The timing of a dose can affect free hormone results, so follow the collection instructions or advice from the clinician monitoring your treatment.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan biotin affect thyroid blood test results?\u003c\/summary\u003e\n\u003cp\u003eYes. High biotin intake can cause falsely high or low thyroid results in some laboratory methods. Biotin is vitamin B7, not vitamin B9. Ask a clinician or the testing service whether and for how long it should be paused.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat do positive TPO antibodies mean?\u003c\/summary\u003e\n\u003cp\u003eRaised TPO antibodies can support an autoimmune cause of thyroid dysfunction, particularly Hashimoto's thyroiditis. They can also occur in some people whose TSH and free T4 remain within range.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat do thyroglobulin antibodies mean?\u003c\/summary\u003e\n\u003cp\u003eThyroglobulin antibodies may occur in autoimmune thyroid disease, including Hashimoto's thyroiditis. They need to be considered with TPO antibodies, TSH, free T4, free T3 and symptoms.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan thyroid antibodies diagnose Hashimoto's disease?\u003c\/summary\u003e\n\u003cp\u003ePositive antibodies can support an autoimmune explanation, but diagnosis depends on the full thyroid pattern and clinical context. Antibodies alone do not show whether the thyroid is currently underactive.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this test check for Graves' disease?\u003c\/summary\u003e\n\u003cp\u003eThe panel can identify hormone patterns consistent with an overactive thyroid, and TPO or thyroglobulin antibodies may sometimes be raised. It does not include TSH receptor antibodies, the antibody test more specifically used when Graves' disease is suspected.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan I have thyroid symptoms with a normal TSH?\u003c\/summary\u003e\n\u003cp\u003eYes. Symptoms such as tiredness, weight change and hair changes are not specific to thyroid disease. A normal result does not exclude every medical cause, and unusual free hormone patterns may still require clinical review.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eCan illness affect thyroid blood tests?\u003c\/summary\u003e\n\u003cp\u003eYes. Acute illness and recovery can temporarily alter thyroid hormone patterns. Follow the kit advice about delaying non urgent testing after a recent infection or illness.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat thyroid result patterns may need medical review?\u003c\/summary\u003e\n\u003cp\u003eHigh TSH with low free T4 may suggest an underactive thyroid, while low TSH with high free T4 or free T3 may suggest an overactive thyroid. Discordant or critical results require professional interpretation.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhen are thyroid symptoms urgent?\u003c\/summary\u003e\n\u003cp\u003eSeek urgent help for severe breathlessness, chest pain, collapse, marked confusion, very rapid or irregular heartbeat, extreme drowsiness, high fever with agitation or other severe symptoms.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eAre the laboratories UKAS accredited and CQC registered?\u003c\/summary\u003e\n\u003cp\u003eSamples are processed through UKAS accredited laboratories within a CQC registered diagnostic pathway. Collection equipment is UKCA and CE marked and supported by an ISO 13485 quality management framework.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/section\u003e\n\u003csection class=\"th_footer_note\"\u003e\n\u003ch3\u003eMedical guidance\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDo not wait for a home test if you feel seriously unwell.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSeek urgent medical advice for severe breathlessness, chest pain, collapse, marked confusion, a very rapid or irregular heartbeat, extreme drowsiness, high fever with agitation or other severe symptoms.\u003c\/p\u003e\n\u003cp\u003eSpeak with a GP promptly for unexplained weight loss, persistent palpitations, a neck swelling, difficulty swallowing, eye changes, pregnancy with thyroid symptoms or a critical laboratory result.\u003c\/p\u003e\n\u003cp\u003eThis product measures selected thyroid markers. It is not a substitute for a medical consultation, physical examination, diagnosis or treatment.\u003c\/p\u003e\n\u003c\/section\u003e\n\u003c\/article\u003e","brand":"My Store","offers":[{"title":"Default Title","offer_id":54410475864403,"sku":"495-advanced-thyroid-hor","price":109.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/files\/Home_Advanced_Thyroid_Test_Kit_UK_-_Hormones_Antibodies.png?v=1785150104"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1088\/7918\/4211\/collections\/Home_Thyroid_Test_Kit_UK_-_TSH_T3_T4_Blood_Test.png?v=1785231296","url":"https:\/\/gracebelgravia.com\/collections\/home-thyroid-test-kits-private-blood-tests-uk.oembed","provider":"Grace Belgravia","version":"1.0","type":"link"}