Serum Phosphorus (or Serum Phosphate) test measures the amount of phosphate, a crucial electrolyte, circulating in your blood. Phosphorus, which exists in the body primarily as phosphate is essential because it:
The levels of phosphate are tightly regulated by the kidneys, parathyroid hormone (PTH), and Vitamin D. The test is commonly ordered to help diagnose conditions related to kidney function, bone health, and parathyroid gland disorders.