Oxalate, Urine



To identify patients who are at risk for renal calculus formation or hyperoxaluria related to malabsorption.

Patient Preparation
There are no fluid, activity, or medication restrictions unless by medical direction. Instruct the patient to abstain from calcium supplements, gelatin, rhubarb, spinach, strawberries, tomatoes, and vitamin C for at least 24 hr before the test. High-protein meals should also be avoided for 24 hr before specimen collection. Protocols may vary among facilities. Usually, a 24-hr urine collection is ordered. As appropriate, provide the required urine collection container and specimen collection instructions.

Normal Findings
Method: Spectrophotometry.

Conventional UnitsSI Units (Conventional Units × 11.1)
Children and adultsLess than 40 mg/24 hrLess than 444 micromol/24 hr

Critical Findings and Potential Interventions

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