Evaluate individuals with calcium oxalate renal calculi.
Patient should avoid ingestion of vitamin C prior to collection.
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 aliquot to an ARUP Transport Tube with Sulfamic Acid (ARUP supply #48098). Available online through eSupply using ARUP Connect or contact ARUP client services at (800) 522-2787. (Min: 1.5 mL) Mix well. Freeze immediately.
Unpreserved: Transport a 4 mL unadjusted aliquot of urine to an ARUP Standard Transport Tube. (Min: 1.5 mL) Freeze immediately.
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered
Record total volume and collection time interval on transport tube and test request form.
After collection complete: Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month
|Creatinine, Urine - per 24h||
|Oxalate, Urine - per 24h||Effective May 15, 2017
0-12 years: 7-31 mg/d
Male 13 years and older: 16-49 mg/d
Female 13 years and older: 13-40 mg/d
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.
|Component Test Code*||Component Chart Name||LOINC|
|0020207||Creatinine, Urine - per volume||2161-8|
|0020208||Creatinine, Urine - per 24h||2162-6|
|0020255||Oxalate, Urine - per 24h||2701-1|
|0020484||Oxalate, Urine - per volume||2700-3|