| A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # |
Phosphorus, Serum
MessageTest performed at York Hospital Laboratory.
Test Code
PHOS
Alias/See Also
Phosphate
CPT Codes
84100
Preferred Specimen
0.2 mL serum collected in a serum separator tube (SST)
Other Acceptable Specimens
0.2 mL serum collected in a no additive (red-top) tube, transferred to a plastic screw-cap vial 0.2 mL plasma collected in a lithium heparin (green-top) gel separator tube
Instructions
Separate serum or plasma from the cells within 4 hours of collection.
Transport Temperature
Refrigerated
Specimen Stability
Room temperature: 3 days
Refrigerated: 7 days
Frozen: 2 months
Refrigerated: 7 days
Frozen: 2 months
Reject Criteria (Eg, hemolysis? Lipemia? Thaw/Other?)
Hemolyzed specimens
Methodology
Spectrophotometry
Setup Schedule
Daily
Report Available
Next Day Available STAT 1/2 Hour
Reference Range
| Age | Phosphorus (mg/dL) |
|---|---|
| <5 Days | 4.6 - 8.0 |
| 1 Month - 3 Years | 3.9 - 6.5 |
| 4-6 Years | 3.7 - 5.4 |
| 7-11 Years | 3.7 - 5.6 |
| 12-13 Years | 3.3 - 5.4 |
| 14-15 Years | 2.9 - 5.4 |
| 16-19 Years | 2.8 - 4.6 |
| Adult | 2.5 - 4.5 |
Critical Values
<1.0 mg/dL
Clinical Significance
Causes of high phosphorus include dehydration, hypoparathyroidism, hypervitaminosis D, metastases to bone, sarcoidosis, pulmonary embolism, renal failure, and diabetes mellitus with ketosis. Low serum phosphorus is found in primary hyperparathyroidism and other causes of serum calcium elevation, sepsis, vitamin D deficiency, renal tubular disorders, chronic hemodialysis, vomiting, and occasionally with decreased dietary phosphate intake.
