The T4 (Thyroxine) test is a blood test that measures the level of thyroxine, one of the main hormones produced by the thyroid gland. T4 plays a vital role in regulating the body’s metabolism, energy production, body temperature, heart function, and overall growth and development. This test helps evaluate thyroid gland function and determine whether the thyroid is producing the correct amount of hormone needed for normal body functions.
This test is commonly recommended when a person experiences symptoms such as fatigue, unexplained weight gain or weight loss, sensitivity to cold or heat, hair loss, dry skin, rapid heartbeat, mood changes, or when a doctor suspects a thyroid disorder. It helps diagnose and monitor conditions such as hypothyroidism, hyperthyroidism, goiter, thyroid hormone imbalance, and other thyroid gland disorders. The T4 test is often performed along with T3 and TSH tests to provide a complete evaluation of thyroid health and help doctors determine appropriate treatment and ongoing monitoring when abnormal thyroid hormone levels are detected.
