Phosphate (as Phosphorus)

CPT Code(s) 84100 Quest code 718

Methodology: Spectrophotometry (SP)

Reference Range(s)

4.0-9.0 mg/dL

1 Week-2 Years 

4.0-8.0 mg/dL

3-12 Years

3.0-6.0 mg/dL

13-64 Years

2.5-4.5 mg/dL

>64 Years

2.1-4.3 mg/dL

Clinical Significance

Serum phosphorus (Phosphate) levels alone are of limited diagnostic value and should be correlated with serum calcium levels. An increased phosphorus with decreased calcium suggests either hypoparathyroidism or renal disease. A decreased phosphorus and an increased calcium suggests hyperparathyroidism or sarcoidosis. When both calcium and phosphorus are decreased diagnostic considerations include malabsorption, vitamin D deficiency and renal tubular acidosis. Increased phosphorus and normal or increased calcium suggests Milk-alkali syndrome or hypervitaminosis D.

Alternative Name(s) Phosphorus

Preparation: No special preparations on your part for this test. As with any blood draw, it is a good practice to drink water ahead of the draw so that you are well hydrated.

Estimated time to receive results is 1-2 days

For more Information on any of your lab test results

  • Consult your physician
  • Review the information on the independent, non-profit web site: www.labtestsonline.org

These are not intended as diagnostic comments, but only to give you sufficient information for further discussion with your physician. It is important that you promptly consult your physician regarding any abnormal findings.

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