Find Locations
For hours, walk-ins and appointments.Special Instructions
State patient's age and sex on the test request form and the specimen container. Specimens submitted without preservative should be acidified after receipt to pH ≤3 with 6N HCl prior to aliquoting.
Expected Turnaround Time
4 - 7 days
Turnaround time is defined as the usual number of days from the date of pickup of a specimen for testing to when the result is released to the ordering provider. In some cases, additional time should be allowed for additional confirmatory or additional reflex tests. Testing schedules may vary.
Related Documents
Specimen Requirements
Specimen
Urine (random)
Volume
10 mL
Minimum Volume
2.5 mL
Container
Use random urine transport tube or urine Monovette® with pH stabilizer (LabCorp N° 56015). Monovette® instructions accompany units.
Collection
Collect urine and transfer to a random urine transport tube or urine Monovette® with pH stabilizer (LabCorp N° 56015).
Storage Instructions
Maintain acidified urine at room temperature. Acid prevents crystallization and conversion of ascorbate (vitamin C) to oxalate.
Stability Requirements
Temperature | Period |
|---|---|
Room temperature | 7 days |
Refrigerated | 7 days |
Frozen | 14 days |
Freeze/thaw cycles | Stable x3 |
Patient Preparation
Avoid vitamin C supplements and vitamin C-rich foods (eg, citrus fruits like oranges, orange juice; vegetables like broccoli, tomatoes, peppers, potatoes) for 48 hours prior to collection.
Causes for Rejection
Urine sample received with a pH not ≤3 from a patient on high doses of vitamin C
LOINC® Map
| Order Code | Order Code Name | Order Loinc | Result Code | Result Code Name | UofM | Result LOINC |
|---|---|---|---|---|---|---|
| 123500 | Oxalate/Creat Ratio, Random U | 103903 | Oxalates, Urine | mg/L | 2700-3 | |
| 123500 | Oxalate/Creat Ratio, Random U | 013672 | Creatinine, Urine | mg/dL | 2161-8 | |
| 123500 | Oxalate/Creat Ratio, Random U | 123501 | Oxalate/Creat. Ratio | mg/g creat | 13483-3 |
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