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Oxalate, 24 Hr Urine (0020482)
Patient Preparation: Patient should avoid ingestion of vitamin C prior to collection.
Collect: 24-hour urine. Refrigerate during collection.
Thoroughly mix entire collection (24-hour) in one container. Do not exceed 4 mL in Tubes.
Preserved: Transfer 4 mL (1.5 mL minimum) aliquot to an ARUP Transport Tube with Sulfamic Acid. Mix well. Freeze immediately.
Unpreserved: Transport a 4 mL (1.5 mL minimum) unadjusted aliquot of urine to an ARUP Standard Transport Tube. Freeze immediately.
Record total volume and collection time interval on transport tube and test request form.
CRITICAL FROZEN: Separate specimens must be submitted when multiple tests are ordered.
Vitamin C (ascorbic acid) quickly degrades to oxalate in non-acidified urine. Patients should discontinue use of vitamin C supplements at least 48 hours prior to the start of urine collection and abstain until collection is complete.
Preservation with Sulfamic Acid before transporting is highly recommended.
Specimens shipped ambient or refrigerated.