Phosphorus, 24-Hour Urine
Also known as: Urine Phos, Urine Phosphorus
Use
Evaluate calcium/phosphorus balance.
Special Instructions
The test request form must state the date and time collection started, date and time collection finished, and urine volume. Specimens submitted without preservative should be acidified after receipt to a pH <2.0 with 6N HCl.
Limitations
Testing is subject to proper specimen collection and handling. pH must be maintained properly, and specimens are stable for 14 days at room temperature, refrigerated, or frozen, with a tolerance for three freeze/thaw cycles. Improperly labeled specimens will be rejected.
Methodology
Automated Analyzer (Clinical Chemistry)
Biomarkers
LOINC Codes
- 2779-7
- 2778-9
- 2779-7
Result Turnaround Time
1-2 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
10 mL aliquot of entire collection
Minimum Volume
0.5 mL aliquot
Container
Plastic urine container. Collect with 6N HCl.
Collection Instructions
Instruct the patient to void at 8 AM and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (i.e., 8 AM the next morning). Screw the lid on securely. Mix well. pH must be 0 to 2.
Storage Instructions
Maintain specimen at room temperature.
Causes for Rejection
Improper labeling
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | 14 days |
| Refrigerated | 14 days |
| Frozen | 14 days |