Test ID: OXU
Oxalate, Urine
Specimen Type 
Describes the specimen type needed for testing
Specimen Required Defines the optimal specimen. This field describes the type of specimen required to perform the test and the preferred volume to complete testing. The volume allows automated processing, fastest throughput and, when indicated, repeat or reflex testing.
Container/Tube: Plastic, 10-mL urine tube (Supply T068) or a clean, plastic aliquot container with no metal cap or glued insert
Specimen Volume: 5 mL
Collection Instructions:
1. Collect urine for 24 hours.
2. Add 30 mL of 6N HCl at end of 24-hour urine collection (within 4 hours of completion of collection).
3. Adjust pH to 2.5 to 3 with 6N HCl and mix well before aliquot is taken.
Additional Information:
1. 24-Hour volume is required.
2. Avoid taking large doses (>2 g orally/24 hours) of vitamin C during specimen collection.
3. See Urine Preservatives in Special Instructions for multiple collections.
Urine Preservative Collection Options
| Ambient | Yes |
| Refrigerated | Yes |
| Frozen | Yes |
| 6N HCl | Preferred |
| 50% Acetic Acid | Yes |
| Na2CO3 | No |
| Toluene | Yes |
| 6N HNO3 | Yes |
| Boric Acid | Yes |
| Thymol | Yes |
Specimen Minimum Volume Defines the amount of specimen required to perform an assay once, including instrument and container dead space. Submitting the minimum specimen volume makes it impossible to repeat the test or perform confirmatory or perform reflex testing. In some situations, a minimum specimen volume may result in a QNS (quantity not sufficient) result, requiring a second specimen to be collected.
Reject Due To Identifies specimen types and conditions that may cause the specimen to be rejected
| Hemolysis | NA |
| Lipemia | NA |
| Icterus | NA |
| Other | Specimen collected or sent in container with metal cap |
Specimen Stability Information Provides a description of the temperatures required to transport a specimen to the laboratory. Alternate acceptable temperature(s) are also included.
| Specimen Type | Temperature | Time |
|---|---|---|
| Urine | Refrigerated (preferred) | 7 days |
| Frozen | 7 days |
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