Phosphate (as Phosphorus) : 718

Test Code
PHOSAU or 718

Alias/See Also

CPT Codes

Transport Container
Preferred Specimen
1 mL serum
Minimum Volume
0.5 mL

Transport Temperature
Room temperature.

Specimen Stability
Room temperature: 72 hours; Refrigerated: 7 days; Frozen: 28 days

Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Gross hemolysis, Plasma


Setup Schedule
Sunday - Saturday

Report Available
1 day

Reference Range
No age                  2.5-4.5 mg/dL 
<7 Days                4.0-9.0 mg.dL 
7 Days-2 Years     4.0-8.0 mg/dL 
3-12 Years            3.0-6.0 mg/dL 
13-15 Years          3.2-6.0 mg/dL 
16-18 Years          3.0-5.1 mg/dL 
19-20 Years          2.7-5.0 mg/dL 
21-64 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.

Performing Laboratory
med fusion

The CPT Codes provided in this document 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. Any Profile/panel component may be ordered separately. Reflex tests are performed at an additional charge.