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Laboratory: Clinical Biochemistry  (METABOLIC)
Test Name:
OXALATE – Random (Oxalate/Creatinine Ratio) - (U)
Test Code: OXU
Clinical Information:
Test Indications: OXALATE/CREATININE RATIO
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 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 protocol:
• Collect first-morning urine
Collection Devices:
Specimen Required:
Urine: 10.0 mL
Pediatric Urine: 5.0 mL
Referral:
Requisition:
Reference Values:
AGE GROUPS              Reference Ranges (Oxalate µmol/mmol creatinine)
0 - 1 mo:                       500
2 - 6 mo:                       500
7 - 12 mo:                     375
13 mo - 6 y:                  190
7 - 10 y:                        125
> 10 y:                          100


Method of Analysis: Enzymatic

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