CPT® Code 84590

The CPT® Code 84590 refers to a laboratory test specifically designed to measure the levels of vitamin A, also known as retinol, in the blood. Vitamin A is a crucial nutrient that plays a significant role in various bodily functions, particularly in maintaining healthy vision, skin, teeth, mucous membranes, and soft tissues. Retinol, the storage form of vitamin A, is essential for the production of pigments in the retina, which are vital for proper vision. When vitamin A levels are decreased, individuals may experience a range of health issues, including increased susceptibility to infections and potential vision problems, which can lead to blindness if left unaddressed. Conversely, elevated levels of vitamin A can occur in patients with renal compromise, such as those suffering from kidney disease, as well as due to certain drug interactions that affect vitamin A metabolism. The test is performed by obtaining a blood sample through venipuncture, which is a procedure that involves puncturing a vein to collect blood. The serum or plasma obtained from the blood sample is then analyzed using quantitative high-performance liquid chromatography, a sophisticated technique that allows for precise measurement of vitamin A levels in the bloodstream.