Test Details
Mnemonic
UOX24
Ordering Code
1004205
CPT-4 Code(s)
83945, 82570
Specimen Information
Patient Preparation
Patients should refrain from Vitamin C supplements during and for 48 hours prior to urine collection for oxalate.
Collect
24 hour urine. The bladder must be emptied at the time the collection is to begin, and this urine is discarded. Thereafter all urine must be collected until the end of the scheduled time. Collect urine with 25 mL of 6N HCl at start of collection to maintain pH between 1 and 3. Refrigerate urine during collection (critical). Mix the collection well before removing aliquot.
Specimen Preparation
Send 25.0 mL preserved urine in a screw capped plastic urine container. Record total volume on test requisition and specimen label.
Alternate Specimen
Alternate method of collection for 24 hour. Refrigerate urine during collection (critical) and add 25 mL of 6N HCl to the entire collection within 4 hours of completing. Mix the collection well before checking the pH. Ensure pH is between 1 - 3. Record total volume on test request and on container label. Send 25 mL aliquot refrigerated in a screw-capped plastic urine container.
Alternate method of collection for time urine sample: Requirements are the same as for 24 hour collection.
Alternate method of collection for time urine sample: Requirements are the same as for 24 hour collection.
Minimum Volume
10.0 mL
Transport Temperature
Refrigerated
Rejection Criteria
pH other than 1 - 3
Stability
Room temperature: Unacceptable
Refrigerated: 7 days
Frozen: 7 days
Refrigerated: 7 days
Frozen: 7 days
Methodology
Spectrophotometry
Reference Range
Males: 0 - 45 mg/24 hours
Females: 0 - 42 mg/24 hours
Urine Creatinine:
Males: 1.0 - 2.0 g/24 hours
Females: 0.8 - 1.8 g/24 hours
No reference ranges available for timed or random samples
Females: 0 - 42 mg/24 hours
Urine Creatinine:
Males: 1.0 - 2.0 g/24 hours
Females: 0.8 - 1.8 g/24 hours
No reference ranges available for timed or random samples
Performing Laboratory
Warde Medical Laboratory
New York DOH Approval Status
Yes