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Thyroid Function Blood Test

Thyroid Function Blood Test

£35.00 £39.00

A convenient home thyroid function test which tests for TSH, FT4 and FT3. Find out if you have the right level of thyroid hormones for healthy metabolism.
Blood sample 3 biomarkers included Results in 2 working days from sample receipt at lab
Thyroid Function Blood Test
Thyroid Function Blood Test
Thyroid Function Blood Test
Thyroid Function Blood Test
Thyroid Function Blood Test

Is it for you?

Do you have symptoms of a thyroid disorder and want to test both thyroid hormones as well as TSH? Or are you already taking levothyroxine but not feeling as well as you should be? If you want a thorough check of your thyroid hormones to make sure that you are converting T4 to the more active T3, then this quick, affordable, thyroid function test is the right test for you.

What's included?

Biomarker profile

  • Thyroid Hormones

Thyroid Hormones (3 Biomarkers)

Special instructions

Please take your sample in the morning. If you are taking a T3 containing medication take your test in the hour prior to your dose of medication. Do not take biotin supplements for 2 days prior to this test. If you are taking prescribed biotin you should discuss this with your doctor.

From the expert

Formerly known as Thyroid Monitoring Blood Test.

The Thyroid Function Blood Test is an excellent test to check and monitor your thyroid hormones. It includes thyroid stimulating hormone (TSH) as well as free T4 (FT4) and free T3 (FT3). This test measures the level of free or unbound thyroid hormones which are biologically active. Most thyroid hormones are bound to proteins in the blood which transport them around your body. However, if thyroid hormones are bound, they are not readily available to your cells. FT4 and FT3 are a better measure of your thyroid function than measuring total levels of T4 and T3, and are more likely to explain any symptoms that you may have. 

Tests which only include TSH and FT4, don't identify those people who do not convert FT4 to the more biologically active FT3 easily. It is possible to have optimal levels of TSH and FT4 but still experience symptoms of an underactive thryoid if your levels of FT3 are low. This profile is especially important for people who are being treated for an underactive thyroid but are still experiencing symptoms, and for people who are taking some form of T3 medication like liothyronine or natural desiccated thyroid (NDT).

TSH is produced by the pituitary gland to stimulate the thyroid to produce thyroid hormones (mostly T4). If your TSH is high it often signifies that your thyroid is struggling to produce enough T4 for your body's needs. TSH on its own does not necessarily give a true picture of your thyroid function which is why it is important to test the thyroid hormones too.

Why take this test?

  • You have symptoms which could be caused by an overactive or underactive thyroid
  • You want to test your free thyroxine (FT4) and your free triiodothyronine (FT3) to check that you are converting properly
  • You are taking thyroid medication and want a regular check of your hormone levels
  • Your doctor will not routinely test your FT3
Laboratories you can trust

Laboratories you can trust

Trusted by the NHS and private clinics alike, you can be sure of the highest testing standards from our UKAS accredited partner laboratories.

Dr Sam Rodgers - Chief Medical Officer

Expert interpretation of your results

One of our team of doctors will review your results and give you personalised advice based on your medical history, lifestyle and health and fitness goals.

Your personal health centre

Your personal health centre

Discover the easy way to track your health through our online portal, View your results with doctor's advice, monitor any changes over time and see the improvements you can make to your health with simple lifestyle changes.

Questions? Let us help

Questions? Let us help

Our customer care team is on-hand to help you find the test that's right for you. Get in touch via phone, live chat or email.

What our customers say

We ask every Medichecks customer about their experience - read what they have to say


Our tests are not a substitute for seeing your doctor, especially if you are suffering symptoms. Our doctors will interpret your results based on the information you have provided, but will not diagnose, consult or provide any treatment. You will be advised to see your doctor for any necessary follow-up action.