CPT® Code 84482

The CPT® Code 84482 refers to the laboratory test for measuring reverse triiodothyronine (rT3) levels in a blood sample. Triiodothyronine, commonly known as T3, is a crucial hormone produced by the thyroid gland that plays a significant role in regulating various metabolic processes within the body, including body temperature, growth, and heart rate. T3 exists in two forms: the majority, approximately 95%, is bound to proteins in the bloodstream and is considered inactive, while the remaining 5% is free and biologically active. The measurement of T3 levels is essential for assessing thyroid function, diagnosing conditions such as hyperthyroidism, and monitoring patients with existing thyroid disorders. In the context of this test, reverse T3 is an inactive form of T3 that may be produced when the thyroid does not generate sufficient amounts of active T3 or when T4, another thyroid hormone, is not adequately converted into T3. The presence of elevated levels of reverse T3 can indicate potential thyroid dysfunction. The testing for reverse T3 is performed using radioimmunoassay, a sensitive laboratory technique that allows for the precise quantification of hormone levels in the blood. This test is particularly valuable in the comprehensive evaluation of thyroid health and function.