Inorganic Phosphate Blood Test - Normal, High, Low

Phosphorus is a mineral that combines with other substances to form organic and inorganic phosphate compounds. The terms phosphorus and phosphate are often used interchangeably when talking about testing, but it is the amount of inorganic phosphate in the blood that is measured with a serum phosphorus/phosphate test.

A normal range for adults is generally 2.5 to 4.5 mg/dL.

Low levels of phosphorus (hypophosphatemia) in the blood may be due to or associated with:

  • Increased blood calcium (hypercalcemia), especially due to hyperparathyroidism
  • Overuse of diuretics
  •  Malnutrition
  •  Alcoholism
  •  Severe burns
  •  Diabetic ketoacidosis (after treatment)
  •  Hypothyroidism
  • Decreased blood potassium (hypokalemia)
  •  Chronic antacid use
  • Rickets and osteomalacia (due to vitamin D deficiencies)

Higher than normal levels of phosphorus (hyperphosphatemia) in the blood may be due to or associated with:

  •  Kidney failure
  •  Liver disease
  • Hypoparathyroidism
  • Diabetic ketoacidosis (when first seen)
  • Increased dietary intake (phosphate supplementation)
* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.