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HelpTest Code LAB113 Phosphorus Serum
Clinical System Name
Phosphorus Serum
Synonyms
Phosphate; PO4 - Blood; PHOS
Sample Requirements
Specimen: Whole Blood
Container(s): Lt. Green/Mint Top Lithium Heparin, Lt. Green/Lithium Heparin Microtainer, Gold SST, Gold Microtainer, Dark Green/Sodium Heparin, Red
Preferred Vol: 1.0 mL
Minimum Vol: 0.5 mL
Note: Method is affected by hemolysis, lipemia, fluoride, oxalate, and EDTA. Not affected by icterus.
Processing Instructions
Reject due to: Insufficient Quantity, Marked Hemolysis, age of specimen
Spin: Y
Aliquot: Y
Storage location: Core Chemistry Refrigerator
Off-site collection: Avoid hemolysis. Specimen should be centrifuged within 2 hours of collection. Spin blood and transfer serum or plasma to plastic tube and refrigerate or freeze.
Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum or Plasma | RT |
≤ 3 d |
| Serum or Plasma | 2-4 C |
≤ 7 d |
| Serum or Plasma | -20 C or -70 C |
≤ 60 d |
Availability
| STAT | Performed | TAT |
|---|---|---|
| Y | 24/7 | 1 h |
Performing Laboratory
Seattle Children's Laboratory
Department
Department: Core Chemistry
Phone Number: 206-987-2617 (Client Services)
CPT Codes
84100
Methodology
Method: Colorimetric method by Vitros 4600
Analytical Volume: 0.02 mL + 0.03 mL dead space
Reference Range
| Age | mg/dL |
| 0 - 7 d | 4.6 - 8.0 |
| 1 w - 4 y | 3.9 - 6.5 |
| 4 y - 7 y | 4.0 - 5.4 |
| 7 y - 12 y | 3.7 - 5.6 |
| 12 y - 14 y | 3.3 - 5.4 |
| 14 y - 16 y | 2.9 - 5.4 |
| 16 y - adult | 2.8 - 4.6 |
Description
Causes of high serum phosphorous include dehydration, hypoparathyroidism, hypervitaminosis D, metastases to bone, sarcoidosis, pulmonary embolism, renal failure, and diabetes mellitus with ketosis. Low serum phosphorous 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.
Critical Values
≤ 1.0 mg/dL
≥ 12.0mg/dL