Free T3

Free T3, or free triiodothyronine, is an important hormone produced by your thyroid gland. It helps regulate your body's metabolism, energy levels, and overall functioning. Free T3 is the unbound form of the hormone, meaning it’s not attached to proteins in your blood and is available to enter your body's cells. Measuring free T3 levels in your blood helps doctors assess thyroid health and diagnose conditions like hypothyroidism or hyperthyroidism. Normal free T3 levels indicate your thyroid is producing the right amount of hormone to support your body's needs.