Phosphorus, Random, Urine
Use
This test is useful for the evaluation of hypo- or hyperphosphatemic states and can be used to evaluate patients with nephrolithiasis. The regulation of urinary phosphorus excretion is primarily dependent on the proximal tubules in the kidneys reabsorbing phosphorus. Various factors can affect this, including dietary intake, hormone levels, and renal tubular health. Understanding phosphorus levels in the urine can aid in diagnosing or managing conditions related to phosphate metabolism.
Special Instructions
When ordering this test, if not done electronically, complete and send a Renal Diagnostics Test Request form with the specimen. The test requires no preservative during collection, and the specimen should be handled correctly to ensure accurate results. Reports are available containing normal and abnormal results for reference, and an international version for specific accounts.
Limitations
This test does not provide established reference values on its own and must be interpreted alongside serum phosphorus levels to calculate fractional excretion. Variations in dietary intake, medical conditions, and medications can influence phosphorus excretion. Interpret results in conjunction with the patient's clinical context to avoid misdiagnosis related to improper specimen collection or handling.
FDA ApprovedNew York Approved
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 2778-9
- 2778-9
Result Turnaround Time
1-3 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
4 mL
Minimum Volume
1 mL
Container
Plastic, 5-mL tube
Collection Instructions
Collect a random urine specimen. No preservative.
Causes for Rejection
All specimens will be evaluated at Mayo Clinic Laboratories for test suitability.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 7 days |
| Refrigerated | 14 days |
| Frozen | 30 days |