Phosphate (as Phosphorus)Main Content
Test Code: 718
CPT Code(s): 84100
Methodology: Spectrophotometry (SP)
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; PO4; Inorganic Phosphorus
Supply: T01 - Red/Gray SST 8.5mL
Preferred Specimen: Serum
Preferred Volume: 1mL
Transport Container: Serum Separator Tube (SST)
Transport Temperature: Room Temperature
Specimen Stability: Room Temperature: 7 days
Rejection Criteria: Plasma; Gross hemolysis
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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 Payor being billed.