A Thyroid Function Test (TFT) is a group of blood tests used to evaluate how well the thyroid gland is functioning. The thyroid gland controls metabolism, energy levels, growth, and body temperature through the production of hormones. A TFT commonly measures T3 (Triiodothyronine), T4 (Thyroxine), and TSH (Thyroid Stimulating Hormone) levels in the blood. These tests help diagnose thyroid disorders such as hypothyroidism (underactive thyroid) and hyperthyroidism (overactive thyroid). Doctors may recommend a thyroid function test for symptoms like weight changes, fatigue, hair loss, irregular heartbeat, mood changes, or swelling in the neck. Early diagnosis through TFT helps in effective treatment and maintaining overall hormonal balance and health.