CPT® Code 84480

The CPT® Code 84480 refers to the laboratory test for measuring total triiodothyronine (T3), a crucial hormone produced by the thyroid gland. T3 plays a significant role in regulating various metabolic processes within the body, including body temperature, growth, and heart rate. This test involves analyzing a blood sample to determine the levels of total T3, which encompasses both the bound and free forms of the hormone. Approximately 95% of T3 in the bloodstream is bound to proteins and is considered inactive, while the remaining 5% is free and biologically active. The measurement of total T3 is essential for assessing thyroid function, diagnosing conditions such as hyperthyroidism, and monitoring patients who have existing thyroid disorders. The total T3 test is performed using an electrochemiluminescent immunoassay, a sensitive and specific method for quantifying hormone levels in the blood. Understanding the levels of total T3 can provide valuable insights into a patient's thyroid health and overall metabolic status.