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 (also included sometimes)
Other thyroid tests include:
Guber HA, Farag AF. Evaluation of endocrine function. In: McPherson RA, Pincus MR, eds. Henry's Clinical Diagnosis and Management by Laboratory Methods. 22nd ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 24.
Salvatore D, Davies TF, Schlumberger MJ, et al. Thyroid physiology and diagnostic evaluation of patients with thyroid disorders. In: Melmed S, Polonsky KS, Larsen PR, Kronenberg HM, Larsen PR, et al, eds. Williams Textbook of Endocrinology. 12th ed. Philadelphia, PA: Elsevier Saunders; 2011:chap 11.