Free T3

1 parameter(s) covered

Triiodothyronine (T3) is secreted by the thyroid gland in 2 forms - free & bound. This test measures free form only. T4 gets converted to T3 as required by the body. T3 test is performed to evaluate your thyroid gland function; to help diagnose thyroid disease; to monitor effectiveness of thyroid treatment. Patients with overactive thyroid gland may show high T3 levels but T4 levels maybe normal.