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Mayo Clinic Laboratories

Test Code OXALSO Oxalate, 24 Hour Urine (0020482)

Additional Codes

ARUP Test Code: 0020482

Useful For

Evaluate individuals with calcium oxalate renal calculi

Synonyms/Keywords

Hyperoxaluria, Oxalate

Oxalate, 24 Hr Urine (0020482)

24 OXALSO

Specimen Requirements

Fasting Required	Specimen Type	Preferred Container/Tube	Acceptable Container/Tube	Specimen Volume	Specimen Minimum Volume (allows for 1 repeat)	Pediatric Minimum Volume (no repeat)
No	24 Hour Urine	Urine Jug	Transfer tub	4.0 mL	1.5 mL

Collection/Processing Instructions

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.

Specimen Stability Information

Specimen Type	Temperature	Time
Urine	Frozen	1 month

Rejection Criteria

Specimens shipped ambient or refrigerated.

Test Components

Oxalate

Creatinine, Urine

Reference Range Information

Performing Location

Reference Range

ARUP Laboratories

Creatinine, Urine - per 24h

Age	Male	Female
3-8 years	140-700 mg/d	140-700 mg/d
9-12 years	300-1300 mg/d	300-1300 mg/d
13-17 years	500-2300 mg/d	400-1600 mg/d
18-50 years	1000-2500 mg/d	700-1600 mg/d
51-80 years	800-2100 mg/d	500-1400 mg/d
81 years and older	600-2000 mg/d	400-1300 mg/d

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

Performing Laboratory Name