Oxalate, Urine
Also known as: UOXAL
Use
This test evaluates individuals with calcium oxalate renal calculi, commonly known as kidney stones. It aids in determining the cause or risk of kidney stone formation by measuring the oxalate concentration in the urine. Oxalate is a natural end-product of metabolism that can lead to stone formation when present in high concentrations in the urinary tract.
Special Instructions
Patients should avoid ingestion of vitamin C prior to and during the urine collection period, as vitamin C can degrade into oxalate in non-acidified urine, potentially skewing test results. Preservation with Sulfamic Acid before transporting is highly recommended to ensure accuracy of results.
Limitations
The test results are contingent upon proper sample collection and handling, particularly maintaining the urine sample in frozen condition until analysis. Notably, the test has not been cleared or approved by the US Food and Drug Administration, and any deviations in collection time or volume may require interpretive recalculations using analyte to urine creatinine concentration ratios to ensure accuracy.
New York Approved
Methodology
Other
Biomarkers
LOINC Codes
- 35674-1
- 2162-6
- 2701-1
- 27222-9
- 19153-6
- 30211-7
Result Turnaround Time
1-4 days
Related Documents
For more information, please review the documents below
Specimen
Urine
Volume
4 mL
Minimum Volume
1.5 mL
Container
ARUP Transport Tube with Sulfamic Acid or ARUP Standard Transport Tube
Collection Instructions
Collect 24-hour urine. Refrigerate during collection. Thoroughly mix entire collection in one container. Transfer 4 mL aliquot to specified container. Freeze immediately.
Patient Preparation
Avoid vitamin C ingestion prior to and during collection.
Storage Instructions
Critical frozen. Transport frozen.
Stability Requirements
| Temperature | Period |
|---|---|
| Room Temperature | Unacceptable |
| Refrigerated | Unacceptable |
| Frozen | 1 month |