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HelpTest Code LAB11297 Oxalate - 24 Hour Urine
Department
SEND OUTS
Reference Lab Test Number
UOX24
Collection Requirements
Collect 24 hour urine, refrigerate during collection. See ADDITIONAL INFORAMATION below for preferred 24 hour urine collection instructions and alternate specimen
NOTE: Patients should refrain from Vitamin C supplements during and for 48 hours prior to urine collection for oxalate.
Refer To
Primary Collection Container
24 HR Urine container
Alternate Collection Container
Yellow Urine Vacutainer (No Additive)
Transport
Urine refrigerated
Preferred Transport Temperature
Refrigerated
Processing
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 and PH on test request and on container label. Send 25 mL aliquot.
Stability
Ambient: Unacceptable
Refrigerated: 7 days
Frozen: 7 days
Minimum Testing Volume
10 mL
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.
Methodology
Spectrophotometry
Performed
Tuesday, Friday
Reported
5 Days
CPT Codes
83945; 82570
Unacceptable Conditions
pH other than 1-3.
Additional Information
24 hour urine collection (preferred): 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.
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 (10.0 mL minimum) 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.