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Thyroid Check Blood Test
Thyroid Check Blood Test
Thyroid Check Blood Test
Thyroid Check Blood Test

Thyroid Check Blood Test

A popular first-step thyroid function blood test which measures TSH (thyroid stimulating hormone) and FT4 (free thyroxine) to help diagnose an underactive or overactive thyroid.

Is it for you?

Are you experiencing symptoms like dry skin and hair, weight gain and sensitivity to the cold? Are you unusually tired and wonder whether it could be your thyroid? Or perhaps you're losing weight and feeling like your heart is racing, and wonder whether you could have an overactive thyroid? If you want a quick and simple thyroid screen which includes the tests your doctor would order, then this is the right test for you.
Blood sample 2 biomarkers included 2 working days turnaround

What's included?

Biomarker profile

  • Thyroid Hormones

Thyroid Hormones (2 Biomarkers)

Special instructions

Please take your sample in the morning. 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.
Most investigations into a thyroid disorder begin by testing levels of thyroid stimulating hormone (TSH) and free thyroxine (FT4). TSH is produced by the pituitary gland to stimulate the thyroid to produce more thyroid hormones. Thyroxine (T4) is the main thyroid hormone produced by the thyroid gland - this test measures the amount of free T4 (T4 which is not bound to protein) in the blood.

If your thyroid gland is struggling to produce thyroid hormones, you will typically see your level of TSH rise in an effort to stimulate thyroid production. An elevated TSH and low FT4 result suggests an underactive thyroid (hypothyroidism). 

If you have too much circulating thyroid hormone, your level of TSH will reduce as it has no job to do. Low TSH and raised FT4 indicates an overactive thyroid (hyperthyroidism). 

It is very important to diagnose and correct a thyroid problem as both an overactive and an underactive thyroid not only cause debilitating symptoms, but also can pose serious health risks in the future. 

Dr Sam Rodgers MBBS, MRCGP

Why take this test?

  • You're experiencing unexplained weight gain, fatigue and dry skin and hair (possible underactive thyroid)
  • You feel sensitive to heat, are often anxious and have trouble gaining weight (possible overactive thyroid)
  • Your thyroid hormones have been borderline in the past
  • You have a family history of thyroid disease

How it works

  • Take the test

    Collect your sample at home, visit a partner clinic, or we can even send a nurse to you.
  • Post your sample

    Send your sample back on the same day you take it in the freepost pack to our laboratory.
  • Get your results

    View your results with doctor's advice on your personal dashboard.
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 fully accredited partner laboratories.

Expert interpretation <br>
of your results

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<br>
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.