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
