Thyroid function tests

Thyroid function tests are used to tell whether your thyroid is working normally.

The most common thyroid function tests are:

  • Total, or free T4 (the main thyroid hormone in your blood)
  • TSH (the hormone from the pituitary gland that stimulates the thyroid to produce T4)
  • T3 (the active form of the hormone -- T4 is converted to T3)

Other thyroid tests include:

  • T3 resin uptake (an older test that is rarely used now)
  • Thyroid uptake and scan
  • Thyroid binding globulin
  • Thyroglobulin
Thyroid function test

One way to evaluate the performance of the thyroid is through blood testing. The thyroid function test is a group of common tests used to evaluate how the thyroid is functioning..