ARUP's Laboratory Test Directory

Oxalate, Urine : 0020482

Mnemonic: UOXAL

Methodology: Quantitative Spectrophotometry
Performed: Mon-Fri
Reported: 1-4 days
Specimen Required: Patient Prep: Patient should avoid ingestion of vitamin C prior to collection.

Collect: 24-hour urine. Refrigerate during collection.

Specimen Preparation: Thoroughly mix entire collection (24-hour or random) in one container
2) Adjust pH to 1.5-2 with 6M HCl (approximately 10 mL HCl/24-hour specimen based on normal adult output of 1000-2000 mL/24 hours. Pediatric specimens will require less than 10 mL to reach correct pH).
3) Transfer 4 mL aliquot of adjusted urine to an ARUP Standard Transport Tube. (Min: 1.5 mL)
4) Record total volume and collection time interval on transport tube and test request form. This information is required for test interpretation.)

Storage/Transport Temperature: Refrigerated.

Unacceptable Conditions: Specimens with no preservative or with a pH greater than 3.

Stability (collection to initiation of testing): Ambient: 4 hours; Refrigerated: 1 week; Frozen: 1 month
Reference Interval:
           
 
Test Number Components Reference Interval
 Creatinine (24-hour)  
 
Male Female
3-8 years: 140-700 mg/d
9-12 years: 300-1300 mg/d
13-17 years: 500-2300 mg/d
18-50 years: 1000-2500 mg/d
51-80 years: 800-2100 mg/d
81 years and older: 600-2000 mg/d 		3-8 years: 140-700 mg/d
9-12 years: 300-1300 mg/d
13-17 years: 400-1600 mg/d
18-50 years: 700-1600 mg/d
51-80 years: 500-1400 mg/d
81 years and older: 400-1300 mg/d
 Oxalate, Urine0-12 years: 13-38 mg/d
Male 13 years and older: 7-44 mg/d
Female 13 years and older: 4-31 mg/d

Interpretive Data: Reference intervals for random urine samples (mg/L) are not available.
Note: Since vitamin C (ascorbic acid) quickly degrades to oxalate in nonacidified urine, patients should consider refraining from vitamin C supplements during and for 48 hours prior to urine collection for oxalate.
CPT Code(s): 83945
 
 

 

 

 
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