CPT® Code 84100

The CPT® Code 84100 refers to the laboratory test for measuring inorganic phosphorus, commonly known as phosphate, in blood or urine samples. Phosphate is a vital intracellular anion predominantly located in bone and soft tissue, playing a crucial role in various physiological processes. It is essential for cellular energy production, which is particularly important for the proper functioning of nerves and muscles. Additionally, phosphate is integral to the formation and repair of bones and teeth. Abnormal phosphate levels can indicate underlying health issues; decreased levels are frequently associated with malnutrition and can lead to muscle weakness and neurological dysfunction. Conversely, elevated phosphate levels may suggest problems related to kidney function or parathyroid gland activity. The testing process for CPT® Code 84100 involves obtaining a blood sample through a procedure known as venipuncture, which is separately reportable. The serum or plasma obtained from the blood sample is then analyzed using quantitative spectrophotometry, a method that measures the concentration of phosphate in the sample. This test is critical for diagnosing and monitoring conditions related to phosphate metabolism and overall mineral balance in the body.