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Test Name

Phosphate (as Phosphorus)

CPT Code(s)

84100

Methodology

Spectrophotometry (SP)

Limitations

test

Reference Range(s)

<1 Week 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

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Reference ranges are provided as general guidance only. To interpret test results use the reference range in the laboratory report.

The CPT codes provided are based on AMA guidelines and are for informational purposes only. CPT coding is the sole responsibility of the billing party. Please direct any questions regarding coding to the payer being billed.

* The tests listed by specialist are a select group of tests offered. For a complete list of Quest Diagnostics tests, please refer to our Directory of Services.

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Phosphate (as Phosphorus)
718