Full Thyroid Function

This at home test assesses your thyroid function through the levels of key thyroid hormones as well as thyroid antibodies. The thyroid regulates certain functions in the body such as metabolism, energy and mood.

Collection method:

Finger-prick sample

Number of biomarkers tested: 5


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More about this test

The thyroid is stimulated by thyroid stimulating hormone (TSH) and produces two hormones triiodothyronine (T3) and thyroxine (T4). It is through these hormones that the thyroid regulates the body’s metabolism. Thyroid disorders are very common however the symptoms can frequently be confused with other conditions; tiredness, weight gain, feeling cold, poor concentration, depression, weight loss, heat intolerance, rapid heart rate and anxiety.


Testing thyroid function can be done by looking at the levels of TSH as well as the levels of T3 and T4. Much of the thyroid hormone is bound to carrier proteins, therefore this test looks at the levels of free triiodothyronine (FT3) and free thyroxine (FT4), which is to say the hormone that is available to the body’s cells.


There are many different causes of different thyroid disorders. Autoimmune thyroid disease, where the body’s immune system attacks its own thyroid cells, is a common cause. Therefore this test also tests the levels of thyroid antibodies.

• Blood collection device using finger-prick method
• Tracked 24 return mailing bag
• A doctor validated report
• 2 working days turnaround from sample receipt at lab

Order by 3pm weekdays and your test will be the dispatched the same day (excluding bank holidays). Royal Mail tracked 24 shipping is provided free of charge. You will be emailed your tracking number.

Your results will show the levels of each of the thyroid function markers in your blood and will provide a full picture of how your thyroid is performing. The levels for each will be identified as normal, low or high.

This measures the amount of TSH in the blood. The role of TSH is to stimulate the thyroid gland to produce and release T4 and T3. A high TSH result may mean an underactive thyroid and a low TSH result can indicate an overactive thyroid, however a TSH result should be used in conjunction with other thyroid markers to understand why an excess or deficiency of the hormone is present.

This test measures the amount of T4 in the blood, which is not attached to a specific protein. This free hormone is thought to be responsible for all the thyroid hormone effects in the body. If present with clinical symptoms a high FT4 result may indicate an overactive thyroid, known as hyperthyroidism and a low FT4 result may indicate an underactive thyroid, known as hypothyroidism.

T3 is the active form of the thyroid hormone, thyroxine. 99.7% of T3 is bound to a protein in the blood, the rest is unattached or ‘free’. This test measures the amount of free T3 in the blood. A high FT3 result may indicate an overactive thyroid, known as hyperthyroidism.

TPOAb and TGAb are antibodies, measuring the presence and quantity of these can identify the presence of autoimmune thyroid disease. Mild to moderate levels of thyroid antibodies can be found in a number of autoimmune conditions such as type 1 diabetes, pernicious anaemia, rheumatoid arthritis and SLE. Significantly elevated levels can indicate thyroid autoimmune diseases.

How it works

Choose your test

Take control of your health from our range of home-to-lab tests and we’ll send the kit straight to your door.

Post your sample

Simply collect your sample at home and return it to our network of fully accredited labs for expert analysis.

Get your results

Your results will be delivered via our secure online health hub within days.

Your results

Once your sample has been analysed by our laboratory experts, your results will be collated into a clear, easy to understand report.

We always recommend sharing your report with your doctor or healthcare provider as supplementary information to your overall healthcare. Our tests are not intended as a substitution for professional medical advice and you should speak to your doctor if you are seriously worried in any way about your symptoms.

view sample report