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Test Name:
Phosphorus, Urine, Random
- SBMF No:
23916 - Performance Lab Name:
Automated Lab - Test Mnemonic:
U PHOSR - ABN:
Not required - CPT Code:
84105 - LOINC Code:
2778-9 - Also Known As:
PO4 - Also See:
23308 Phosphorus, Urine, 24-Hour - Spec Type:
Urine, random - Spec Container:
Plastic urine container - Pref Vol:
Entire urine specimen - Min Vol:
2.0 mL - Fasting:
No - Spec Collect:
Routine random urine collection - Spec Store Transport:
Refrigerated - Spec Stability:
8 hours room temperature (20-30°C)
1 week refrigerated (2-8°C) - Methodology:
Photometric - Use:
Evaluate calcium/phosphorus balance
Evaluate nephrolithiasis - Clinical Significance:
Eighty eight percent of the phosphorus contained in the body is localized in bone in the form of calcium phosphate as the apatite Ca2+[Ca3(PO4)2]3 2-. The remainder is involved in intermediary carbohydrate metabolism and in physiologically important substances such as phospholipids, nucleic acids and ATP. Phosphorus occurs in blood in the form of inorganic phosphate and in organically bound phosphoric acid. The small amount of extracellular organic phosphorus is found almost exclusively in the form of phospholipids.The ratio of phosphate to calcium in the blood is approximately 6:10. An increase in the level of phosphorus causes a decrease in the calcium level. The mechanism is influenced by interactions between parathormone and vitamin D. Hypoparathyroidism, vitamin D intoxication and renal failure with decreased glomerular phosphate filtration give rise to hyperphosphatemia. Hypophosphatemia occurs in rickets, hyperparathyroidism and Fanconi’s syndrome. - Reference Range:
Reference ranges not available for random urine specimen - Day Run:
Sun-Sat (daily) - Time Run:
As received - Time Reported:
4 hours - Test Type:
URINE
