OXALATE, QUANT, 24-HOUR URINE
Test Code: LAB421
Interface Code
UOXAL
Synonym
OXU
24 HR
OXALIC ACID
003970
OXALATE, 24 HOUR, URINE
24 HR
OXALIC ACID
003970
OXALATE, 24 HOUR, URINE
Specimen Type
Urine (24-hour)
Specimen Container
Plastic LabCorp 24-hour urine container with 30 mL 6N HCl preservative (LabCorp No. 21584).
Specimen Handling
Instruct patient to void at 8 AM (or 8 PM) and discard the specimen. Then collect all urine including the final specimen voided at the end of the 24-hour collection period (ie, 8 AM [or 8 PM] the following day). Label container with patient's name and date and time collection started and finished. Measure and record total urine volume. Mix well. pH must be less than or equal to 3. Preservative not necessary during collection but should be added to urine collection within 24 hours.
Volume
10 mL aliquot
Minimum Volume
2.5 mL aliquot
Temperature
Maintain ACIDIFIED urine at room temperature. Acid prevents crystallization and conversion of ascorbate (vitamin C) to oxalate.
Unacceptable Conditions
Urine sample received with a pH not less than or equal to 3 from a patient on high doses of vitamin C.
Methodology
Enzymatic
Schedule
Set up and reported Monday thru Friday on 1st and 3rd shift.
Additional Information
State patient's age, sex, and total 24-hour urine volume on the test request form and specimen. Specimens submitted without preservative should be acidified after receipt to pH less than or equal to 3 with 6N HCl prior to aliquoting.
Stability
Room temperature: 7 Days,Refrigerated: 7 Days,Frozen: 14 Days, Freeze/thaw cycles: Stable x3
Reference Range Information
Reference values are dependant upon methodology/instrumentation, check final report for current reference values
Performing Site
LabCorp Laboratory
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