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HelpTest ID ROXUR Oxalate, Random, Urine
Ordering Guidance
A timed 24-hour urine collection is the preferred specimen for measuring and interpreting this urinary analyte. Order OXU / Oxalate, 24 Hour, Urine.
Random collections normalized to urinary creatinine may be of some clinical use in patients who cannot collect a 24-hour specimen, typically small children. Therefore, this random test is offered for children under 16 years old.
Specimen Required
Patient Preparation: Avoid taking large doses (>2 g orally/24 hours) of vitamin C prior to specimen collection.
Supplies: Urine Tubes, 10 mL tube (T068)
Container/Tube: 10-mL plastic tube or a clean, plastic container with no metal cap
Specimen Volume: 7 mL
Collection Instructions:
1. Collect a random urine specimen.
2. No preservative.
3. Specimen pH should be between 4.5 and 8 and will stay in this range if kept refrigerated. Specimens with pH above 8 may indicate bacterial contamination, and testing will be cancelled. Do not attempt to adjust pH as it will adversely affect results.
Forms
If not ordering electronically, complete, print, and send a Renal Diagnostics Test Request (T830) with the specimen.
Useful For
Monitoring therapy for kidney stones using random urine specimens
Identifying increased urinary oxalate as a risk factor for stone formation
Diagnosis of primary or secondary hyperoxaluria
Profile Information
| Test ID | Reporting Name | Available Separately | Always Performed |
|---|---|---|---|
| OXCO1 | Oxalate, Random, U (mmol/L) | No | Yes |
| OXCO3 | Oxalate, Random, U (mg/L) | No | Yes |
| CRETR | Creatinine, Random, U | No | Yes |
| RAT11 | Oxalate/Creatinine Ratio | No | Yes |
Method Name
OXCO1: Enzymatic Using Oxalate Oxidase
CRETR: Enzymatic Colorimetric Assay
OXCO3, RAT11: Calculation
Reporting Name
Oxalate, Random, USpecimen Type
UrineSpecimen Minimum Volume
6 mL
Specimen Stability Information
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 14 days |
| Frozen | 14 days | |
| Ambient | 72 hours |
Reference Values
No established reference values
Day(s) Performed
Monday through Saturday
Report Available
3 to 5 daysPerforming Laboratory
Mayo Clinic Laboratories in Rochester
Test Classification
This test has been modified from the manufacturer's instructions. Its performance characteristics were determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the US Food and Drug Administration.CPT Code Information
83945
82570
LOINC Code Information
| Test ID | Test Order Name | Order LOINC Value |
|---|---|---|
| ROXUR | Oxalate, Random, U | 15086-2 |
| Result ID | Test Result Name | Result LOINC Value |
|---|---|---|
| CRETR | Creatinine, Random, U | 2161-8 |
| OXCO1 | Oxalate, Random, U (mmol/L) | 15086-2 |
| OXCO3 | Oxalate, Random, U (mg/L) | 2700-3 |
| RAT11 | Oxalate/Creatinine Ratio | 13483-3 |