A thyroid profile is a group of tests that are often ordered together to help evaluate thyroid gland function and to help diagnose thyroid disorders. The tests included in a thyroid profile measure the amount of thyroid hormones in your blood. These hormones are chemical substances that travel through the bloodstream and control or regulate your body's metabolism—how it functions and uses energy.

The thyroid profile includes:

  • T4 or Free T4 (thyroxine) to test for hypothyroidism and hyperthyroidism
  • T3 or Free T3 (triiodothyronine) to test for hyperthyroidism