Individual test · Labcorp 503600

Triiodothyronine (T3), Free, Dialysis and LC/MS-MS (Endocrine Sciences)

This test measures the amount of free T3, which is the active thyroid hormone available for your body to use. It uses a specialized technique to ensure accuracy even when other factors in your blood might interfere with standard tests. This measurement helps show whether your thyroid is overactive, a condition often associated with symptoms like rapid heartbeat or unexplained weight loss. While it helps rule out hyperthyroidism, this test cannot diagnose the specific cause of a thyroid problem on its own.