Serum Phosphorus (Serum Phosphorus)

The serum phosphate test measures the amount of phosphate ions present in the blood. A blood sample is collected from a vein, usually in a plain (red-top) tube without anticoagulant, and the serum is separated. In the laboratory, the phosphate concentration is determined using colorimetric or enzymatic assays. In a common colorimetric method, phosphate in the serum reacts with a reagent such as ammonium molybdate to form a colored complex. The intensity of the color, measured by a spectrophotometer, is directly proportional to the phosphate concentration in the sample. The result helps assess bone metabolism, kidney function, and electrolyte balance.

The serum phosphate (phosphate in blood) test measures the concentration of phosphate ions in the blood. Phosphate, a mineral containing phosphorus, plays a key role in conjunction with calcium in the formation and maintenance of strong bones and teeth. Under normal conditions, the kidneys regulate phosphate levels by filtering and excreting excess phosphate to maintain balance in the body.