what is a thyroid function test
Thyroid function tests (TFTs) is a collective term for blood tests used to check the function of the thyroid.t is the most sensitive test for thyroid hormone function. TSH is produced in the pituitary gland. The production of TSH is controlled by TRH, which is produced in the hypothalamus.
Thyroid function tests are blood tests which help to check the function of the thyroid gland. They are mainly used to detect hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid).Note: the information below is a general guide only.hese tests may help doctors to find a specific cause of the low TSH. Thyroid function tests are usually done to find out whether the thyroid gland is working properly. This is mainly to diagnose underactive thyroid (hypothyroidism) and overactive thyroid (hyperthyroidism).