{"product_id":"total-thyroxine-t4","title":"Total Thyroxine (T4)","description":"\u003cp\u003eTotal T4 alongside free T4. Rarely offered in UK direct-to-consumer testing.\u003c\/p\u003e\u003cp\u003eAdd-on markers can only be added to venous samples.\u003c\/p\u003e\u003ch3\u003eTiming\u003c\/h3\u003e\u003cp\u003eTake in the \u003cstrong\u003emorning, ideally fasted\u003c\/strong\u003e, alongside the rest of thyroid function. If you take levothyroxine, take the sample before that day’s dose. A dose taken a few hours earlier lifts T4.\u003c\/p\u003e\u003cp\u003eIdeal, not required. Glucose is the only marker we sell that is invalid unfasted. If fasting does not fit your day, take it anyway and do the same next time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eTurnaround:\u003c\/strong\u003e the lab reports this test within 24 hours of receiving your sample, counted in working days. Most samples reach them within about 3 days of posting. Full detail on our \u003ca href=\"\/pages\/turnaround-times\"\u003eTurnaround Times\u003c\/a\u003e page.\u003c\/p\u003e\u003cp\u003e\u003cem\u003eWe do not interpret results. Not medical advice or a diagnosis.\u003c\/em\u003e\u003c\/p\u003e","brand":"N1 Health","offers":[{"title":"Default Title","offer_id":58266852163928,"sku":"N1-A-TOTAL-THYROXINE","price":8.0,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1007\/1533\/1928\/files\/total-thyroxine-t4-v5.png?v=1787608803","url":"https:\/\/n1health.co.uk\/products\/total-thyroxine-t4","provider":"N1 Health","version":"1.0","type":"link"}