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Thyroid Function Test

Thyroid Function Test (TFT) in London, UK

The level of the thyroid hormones in your blood gives you an idea about the functionality of your thyroid gland. If you want to check the level of your thyroid hormones, a thyroid function blood test is required, but you can also carry out a test to check the TSH level and other thyroid-related hormones or antibodies in your bloodstream. Depending on your result, your private doctor at the London GP clinic in the UK may refer you to a specialist, prescribe medications for you or ask you to perform further tests. 

Thyroid Gland

The thyroid is a butterfly-shaped gland, small in size and located in front of your neck just below your voice box. Its function is the production of hormones that are released into the bloodstream. These hormones perform several functions one of which is the regulation of the body's metabolism (controls the speed of how the body's organ functions). The hormones produced by the thyroid glands keep bodily functions such as digestion, breathing, cholesterol levels, body weight, temperature, heart rate, and menstrual cycle in check.

How does the thyroid gland function?

The thyroid gland produces and secretes two types of hormone:

  • T3- triiodothyronine
  • T4- thyroxine

These two hormones regulate the rate at which the body cells functions

T3 and T4 are synthesised using iodine gotten from foods like dairy products, salt, and seafood. Their production is stimulated by the release of Thyroid Stimulating Hormone (TSH) from the pituitary gland located at the base of the brain. The pituitary gland serves as a control for thyroid levels in the blood.

The thyroid gland can produce excess or insufficient hormones— these conditions are called overactive and underactive thyroidism respectively. Each condition has physical manifestations that are peculiar to it.

An underactive thyroid gland which results in the production of insufficient thyroid hormones is known as hypothyroidism, and it causes the Hashimoto’s disease while Grave’s disease is caused by hyperthyroidism (overactive thyroid glands).

Thyroid imbalance in the blood can be controlled by an effective means which involves taking special prescription medication.

Types of thyroid test we offer

We have 3 different types of thyroid profile test. Each one has a specific set of the parameter that makes it up. These parameters include:

  • Thyroxine (T4) and triiodothyronine (T3) which are produced by the thyroid gland
  • Thyroid-stimulating hormone (TSH) is produced by the pituitary gland
  • Thyroid antibodies- this is recommended by your doctor when you are suspected of having any of the autoimmune thyroid diseases such as Grave’s or Hashimoto disease.


It costs £77, and your result will be ready within 24 hours. The parameters involved in this test include:

  • Free T4
  • TSH


This test costs £224, and you should expect your result in two days. The parameters include:

  • T4
  • Free T3
  • Free T4
  • TSH
  • Thyroid antibodies


We offer this test at the cost of £124.80. Your result will be available within 24 hours, and it includes the following parameters

  • Free T3
  • Free T4
  • TSH

If you want to carry out any of these tests, you can visit our London GP clinic or call us today on 020 70434318.

You can also perform your thyroid test as part of our general health screens.

* A blood draw fee of £50 is payable for blood tests, urine tests and swabs carry no surcharge.