Preparation: No special preparation or fasting required. However, inform your healthcare provider about any medications you are taking, especially thyroid medications, as they may affect the results.

Procedure: A blood sample is drawn from a vein, usually in the arm.

The Free T3 (Tri-iodothyronine) test measures the level of unbound T3 hormone in the blood, which is the active form of thyroid hormone influencing metabolism, heart rate, and body temperature. It helps assess thyroid function and diagnose thyroid disorders such as hyperthyroidism.