CPT® Code 84436

The CPT® Code 84436 refers to the laboratory test for total thyroxine, commonly known as T4. This test involves obtaining a blood sample to measure the levels of total thyroxine in the bloodstream. Thyroxine is a crucial hormone produced by the thyroid gland, and it plays a significant role in regulating various metabolic processes in the body. The total thyroxine measurement includes both bound and unbound (free) thyroxine, providing a comprehensive overview of thyroid function. This test is essential for diagnosing thyroid disorders, specifically hyperthyroidism, where the thyroid is overactive, and hypothyroidism, where the thyroid is underactive. The evaluation of total thyroxine levels helps healthcare providers assess the overall functioning of the thyroid gland and determine appropriate treatment options. The methodology employed for this test is electrochemiluminescent immunoassay, which is a sensitive and accurate technique for measuring hormone levels in the blood.