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HelpTest Code LAB0200618 Phosphorus, 24 Hour, Urine
Additional Codes
| Mayo Test ID |
|---|
| POU |
Performing Laboratory
Mayo Clinic Laboratories in Rochester
Useful For
Evaluation of hypo- or hyper-phosphatemic states
Evaluation of patients with nephrolithiasis
Special Instructions
Method Name
Molybdic Acid
Reporting Name
Phosphorus, 24 HR, USpecimen Type
UrineNecessary Information
24-Hour volume (in milliliters) is required.
Specimen Required
Supplies: Sarstedt 5 mL Aliquot Tube (T914)
Collection Container/Tube: 24-Hour graduated urine container with no metal cap or glued insert
Submission Container/Tube: Plastic, 5 mL tube or a clean, plastic aliquot container with no metal cap or glued insert
Specimen Volume: 4 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Refrigerate specimen within 4 hours of completion of 24-hour collection.
Additional Information: See Urine Preservatives-Collection and Transportation for 24-Hour Urine Specimens for multiple collections.
Specimen Minimum Volume
1 mL
Specimen Stability Information
| Specimen Type | Temperature | Time | Special Container |
|---|---|---|---|
| Urine | Refrigerated (preferred) | 14 days | |
| Frozen | 30 days | ||
| Ambient | 7 days |
Reject Due To
| All specimens will be evaluated at Mayo Clinic Laboratories for test suitability. |
Reference Values
≥18 years: 226-1,797 mg/24 hours
Reference values have not been established for patients who are less than 18 years of age.
Interpretation
Interpretation of urinary phosphorus excretion is dependent upon the clinical situation, and should be interpreted in conjunction with the serum phosphorus concentration.
Day(s) Performed
Monday through Sunday
Report Available
1 to 3 daysSpecimen Retention Time
7 daysTest Classification
This test has been cleared, approved, or is exempt by the US Food and Drug Administration and is used per manufacturer's instructions. Performance characteristics were verified by Mayo Clinic in a manner consistent with CLIA requirements.CPT Code Information
84105
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| POU | Phosphorus, 24 HR, U | 2779-7 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| POUU | Phosphorus, 24 HR, U | 2779-7 |
| TM12 | Collection Duration | 13362-9 |
| VL10 | Urine Volume | 3167-4 |
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.