Oxalic Acid, Urine
OXALATE URINE 24 HOUR
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Compound Enzyme Assay
Renal function test, patients who form calcium oxalate kidney stones appear to absorb and excrete a higher portion of dietary oxalate in urine than do normal patients.
Less than 40 mg/24 hrs (less than 456 mcMol/24 hrs)
* Reference ranges may change over time. Please refer to the original patient report when evaluating results.
Collect 24 hour urine specimen. Add 25 mL of 50% glacial acetic acid (15 mL for pediatric patients) to container prior to start of collection. Following collection, mix very well to dissolve any oxalate crystals that may have formed, measure 24 hour urine volume, aliquot 10 mL into a plastic urine container and refrigerate. Record total 24 hour urine volume and collection dates/times on request form. Specimens with no preservative are also acceptable: send entire 24 hour collection to MLabs. Random urine collections not acceptable.