Have you ever experienced unexplained tiredness, struggling to focus, or mood changes that seem to come from nowhere? For many in the UK, the root cause can be a low Free T3—an often-overlooked thyroid hormone.
Free T3 (triiodothyronine) plays a crucial role in your body’s metabolism and overall wellbeing. While TSH is often tested, it’s possible for Free T3 to be out of balance, causing symptoms even when other tests are within range.
Even in the UK, deficiencies in key minerals like iodine and selenium—found in eggs, fish, and nuts—can affect thyroid function. Chronic stress and poor sleep can also reduce active Free T3, making symptoms worse.
If your symptoms persist, consider checking your Free T3 levels. With our Free T3 Home Blood Test Kit, you can:
You can also book an in-person test with Mayfield Clinic if you prefer face-to-face care.
Learn more about underactive thyroid (hypothyroidism) on the NHS A-Z.
Try making lifestyle changes for a few weeks, but if you don’t improve, a check of your Free T3 can point you in the right direction for treatment or peace of mind. Order your at-home blood test kit now or speak to our team about your options.
If you are experiencing ongoing tiredness, mood changes, difficulty losing weight, dry skin, or persistent hair loss, your thyroid (and specifically Free T3 levels) might be involved. Testing can help pinpoint the cause.
Yes, various lifestyle factors—such as a lack of key nutrients (e.g., selenium, iodine), ongoing stress, and disrupted sleep—can affect Free T3 levels and overall thyroid health.
No, our home blood test uses a small finger-prick sample. It’s convenient and suitable for most UK adults to perform at home without clinical assistance.
Become a Mayfield Clinic member and get direct access to experienced general practitioners
3rd Floor Mayfield House
256 Banbury Road
Oxford
OX2 7DE
.svg)
