Free T4 (FT4 or free thyroxine) is often used in conjunction with TSH to assess thyroid function at a basic level. It is the active form of thyroxine, released from the thyroid gland in the neck. Thyroxine's role is to control metabolism - release of energy from all cells of the body. A lack of thyroxine leads to symptoms which include tiredness and weight gain, whereas an excess will lead to weight loss, rapid heart rate and anxiety. It is generally believed that the Free T4 level is a reliable indicator of thyroid status - ie whether the gland is over-active (hyperthyroidism) or underactive (hypothyroidism).
This Thyroid Test can be taken at Home
This Thyroid blood test is available for fingerprick (microtainer) OR Phlebotomy collectionusing one of our many phlebotomy options across the UK, or you can even choose to arrange your own!
If you're unsure about how to access this test or how the procedure works please watch this short video.
Sample Collection Options for your Free T4 Test
Self Collect at Home
Free - Pay for Test Only
You can easily collect the blood required for our Free T4 Blood Test at Home by using one of our Finger-Prick Collection Kits.
Visit a Partner Clinic
Adds £30 to your Kit Order
We have partnered with Superdrug Pharmacies and Circle Health Hospitals in order to provide you with Accredited Phlebotomy Services.
Nurse Home Visits
Adds £55 to your Kit Order
Let our Nurses come to your home or place of work - we cover Mainland England, Wales, Scotland and Northern Ireland. Fully Accredited .
Do you have a question about Free T4? We aim to get back to you with an answer the same working day.
There's a reason that over 30% of Blue Horizon Kit requests are from patients that have used us before.