The Thyroid Check blood test is for individuals who wish to assess their thyroid function. Your thyroid is a gland in your neck. It produces hormones which influence your metabolic rate and protein production. About 1 in 20 have issues with our Thyroid at some point in our life.
Two hormones commonly know as T4 and T3 are produced in the Thyroid. These hormones influence the metabolism of your body cells. In other words, it regulates the speed with which your body cells work. If too much of the thyroid hormones are secreted, the body cells work faster than normal, and you have an overactive thyroid.
An underactive thyroid can cause symptoms such
If you have an overactive thyroid because of too much secretion of the hormones from the thyroid gland, the increased activity of your body cells or body organs may lead, for example, to a quickening of your heart rate or increased activity of your intestine so that you have frequent bowel motions or even diarrhoea. Other symptoms you might experience include
Our test checks for the levels of two hormones
Thyroid Stimulating Hormone (TSH) is produced in the pituitary gland and stimulates the thyroid gland to produce thyroid hormones thyroxine (T4) and triiodothyronine (T3).
High levels of TSH indicate an underactive thyroid while low levels indicate an overactive thyroid. In primary pituitary failure, a low TSH will be associated with an underactive thyroid.
Thyroxine (T4) is one of two hormones produced by the thyroid gland. Most T4 is bound to carrier proteins in the blood. This test measures the level of T4 which is free, or unbound, circulating in your blood.
Preparing for your test
There is no need to fast or restrict your diet before this test.