Free Triiodothyronine (Free T3 or FT3) is the active form of thyroid hormone in our body - this is the actual hormone that does the work at the cellular level. Although not always needed for monitoring thyroid treatment regimes, many specialists advise testing the level of FT3 particularly if the treatment regime is less conventional.
This Thyroid Test can be taken at Home
This Thyroid blood test is available for fingerprick (microtainer), Tasso Autodraw collection OR Phlebotomy collection using 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 T3 Test
Fingerprick Self-Collect Sample

Free - Pay for Test Only

You can easily collect the blood required for our Free T3 Blood Test at Home by using one of our Finger-Prick Collection Kits.
TASSO Autodraw Self Collect

Adds £15 to your Kit Order

The new TASSO autodraw devices make blood collection as easy as pushing a button, available with this test.
Clinics or Nurse Home Visits

Add £30 for Clinic, or £55 for Nurse home visit

Go to a Partnered Clinic or Pharmacy or Let our Nurses come to your home or place of work anywhere in mainland UK. Or self arrange vacutainer draw yourself for £0
Do you have a question about Free T3? 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.

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Simply choose "Tasso" at checkout for £15 - Using the device is as simple as pressing a button and waiting a few minutes for the blood to be gently drawn from your arm.