Preparation: No special preparation or fasting required, but inform your healthcare provider of any medications you are taking, especially thyroid medications, as they may influence test results.

Procedure: A blood sample is taken from a vein in the arm.

The Free T4 (Thyroxine - Free) test measures the level of unbound T4 hormone in the blood, which plays a key role in regulating metabolism, energy levels, and overall thyroid function. It is commonly used to evaluate thyroid health and diagnose conditions such as hypothyroidism and hyperthyroidism.