Laboratory: Clinical Biochemistry
Test Name:
OXALATE- 24hr - (U)
Test Code: OXU
Clinical Information:
Test Indications: 

Monitoring therapy for kidney stones using 24-hour urine collections. Identifying increased urinary oxalate as a risk factor for stone formation. Diagnosis of primary or secondary hyperoxaluria


Patient Preparation Instructions:
For children, height (cm) and weight (kg) must be recorded on requisition. For 24 hours before, as well as during the collection process, patient should not take large doses (>2 g orally/24 hours) of vitamin C. Ingestion of ascorbic acid may falsely elevate the measured urinary oxalate excretion.
Collection Devices:
Specimen Required:
Urine: 10.0 mL
Pediatric Urine: 5.0 mL
Referral:

Refer to JA110-50-01A 24 Hour Urine Processing Flow Chart


Specimen Stability:

Refrigerated: 14 Days

Frozen: 14 Days
Requisition:
Reference Values:
≥ 17 y:      <500 μmol/d                          (μmol/d x 0.090 = mg/d)
0 - 16 y:    <500 μmol/d/1.73m2


Method of Analysis: Enzymatic
Availability:
Within 2 Weeks
See Also:
More Information:
Health Sciences Centre by Shared Health  Biochemical Genetics Laboratory by spectrophotometery.