Triiodothyronine tests

Triiodothyronine (T3) tests measure the levels of T3 hormone in your blood, which is produced by your thyroid gland. T3 plays a key role in regulating your body's energy use, metabolism, and overall function. The test helps doctors evaluate thyroid health, diagnose conditions like hypothyroidism (underactive thyroid) or hyperthyroidism (overactive thyroid), and monitor treatment effectiveness. Abnormal T3 levels may indicate thyroid problems or other health issues affecting hormone production. The test is simple, involving a blood sample, and provides important information about your metabolic health.