Free T4
Free T4
Free T4
Free T4
Free T4
Free T4

Free T4

Order by 1pm m-f for same day dispatch
Target Turnaround Time in working days: 1
Inclusions: Free T4
Lab Code: FT4
Free Delivery
16+ only and paid phlebotomy options are 18+ only.
Trustpilot
£49.85
/
.
Collect 498 Pathology Points worth £4.99 to put towards future testing.

Thank you - A percentage from your order total goes towards Our Charity of the Month

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).

Special Instructions: Fasting not required. No other special instructions.
Which Tests are Included? Free T4

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 T4 Test

Fingerprick Self-Collect Sample

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.

About Fingerprick Collection

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.

Learn about TASSO

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

Learn More

Do you have a question about Free T4? We aim to get back to you with an answer the same working day.

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Thyroid Premium Bronze
Quick view
£65.35
Number of Tests: 5
Est Turnaround Time: 1


This Enhanced basic check for Thyroid Health comes complete with Magnesium and Cortisol.

TSH, Free T4, Free T3, Magnesium, Cortisol





Thyroid Premium Silver
Quick view
£112.35
Number of Tests: 8
Est Turnaround Time: 1


The addition of Thyroid Antibodies enable the Testing and Monitoring of Thyroid Autoimmune Disease.

TSH, Free T4, Free T3, Magnesium, Cortisol

Total T4, Thyroid Peroxidase Antibodies, Thyroglobulin Antibodies



Thyroid Premium Gold
Quick view
£123.35
Number of Tests: 14
Est Turnaround Time: 1


More Thyroid and Related Biomarkers. Our most popular Thyroid Profile. Go for Gold!

TSH, Free T4, Free T3, Magnesium, Cortisol

Total T4, Thyroid Peroxidase Antibodies, Thyroglobulin Antibodies

Vitamin D (25-OH), Active Vitamin B12, Vitamin B9 (Folate), Ferritin, C-Reactive Protein.

Thyroid Premium Platinum
Quick view
£181.35
Number of Tests: 20
Est Turnaround Time: 20


All the Gold Biomarkers, Plus Reverse T3 and HbA1C for even more detailed health analysis

TSH, Free T4, Free T3, Magnesium, Cortisol

Total T4, Thyroid Peroxidase Antibodies, Thyroglobulin Antibodies

Vitamin D (25-OH), Total and Active Vitamin B12, Vitamin B9 (Folate), Ferritin, Serum Iron, TIBC, Transferrin Saturation, C-Reactive Protein

Reverse T3, HbA1c

Thyroid Resources

Navigating Hypothyroidism Diagnosis
Navigating Hypothyroidism Diagnosis
by Lyn Mynott, Thyroid UK
Thyroid Tests with Cortisol and Magnesium. The Blue Horizon Difference.
Thyroid Tests with Cortisol and Magnesium. The Blue Horizon Difference.
by Dr Graham Johnson
Thyroid Blood Tests - Fingerprick or Whole Blood?
Thyroid Blood Tests - Fingerprick or Whole Blood?
by Dr Graham Johnson
Testing for an Overactive or Underactive Thyroid
Testing for an Overactive or Underactive Thyroid
by Dr Graham Johnson
Quick and Reliable.

There's a reason that over 30% of Blue Horizon Kit requests are from patients that have used us before.

Blue Horizon Blood Test Reviews

⭐⭐⭐⭐⭐

Extremely efficient service from beginning to end. Procedure carried out quickly and efficiently. Results were very swift. Will be using again.

Lisa Underhill-Price
UK
⭐⭐⭐⭐⭐

Impressed with speed of despatch after ordering. Kit and instructions very easy to understand and follow. Posted back to lab Monday morning, results received Wednesday morning, Thanks, may well be back soon.

Paula Loftus
UK
⭐⭐⭐⭐⭐

As always, a superb service by all the BH team. Fast, efficient but very thoughtfuland caring of medical conditions, and associated patient mindset.. highly reccomended .cg

Chris Gomez
UK
⭐⭐⭐⭐⭐

Utterly patient, kind and helpful, kit arrived next day, as did my results. 5 stars well-deserved.

Dell Finniam
UK
⭐⭐⭐⭐⭐

Great service and product. The turn around is brilliant (mostly - there was a glitch during the early part of the Covid pandemic, but that seems to be resolved now). Tests are recognised by the medical profession so I am able to use the results to get the treatment I need without further tests.

Alexis Faulkner
UK
⭐⭐⭐⭐⭐

I had various questions which they answered via email/webchat and the timing of getting a kit, sending it back and getting the results was good.

Bruce Robins
UK

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This Thyroid Test can also be taken using the new TASSO Autodraw unit

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.

Learn more about TASSO