Oxalate, Urine
0020482
Ordering Recommendation
Submit With Order
Mnemonic
UOXAL
Methodology
Quantitative Spectrophotometry
Performed
Mon-Fri
Reported
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Specimen Required
Patient Preparation
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.
Then, perform one of the two processing options below:
Option 1:

a. Adjust pH to 1.5-3.0 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).
b. Transfer 4 mL aliquot of adjusted urine to an ARUP Standard Transport Tube. (Min: 1.5 mL)
c. Record total volume and collection time interval on transport tube and test request form. This information is required for test interpretation.
Option 2:

a. Transfer 4 mL aliquot from the well-mixed 24-hour urine collection (ARUP supply #48098) to an ARUP Standard Transport Tube with 20 mg Sulfamic Acid. (Min: 1.5 mL)
b. 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 4.  
Remarks
 
Stability
Ambient: 4 hours; Refrigerated: 1 week; Frozen: 1 month  
Reference Interval
Test Number Components Reference Interval
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, 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
Components
Component Test Code*Component Chart Name
0020207Creatinine, Urine - per volume
0020208Creatinine, Urine - per 24h
0020255Oxalate, Urine - per 24h
0020484Oxalate, Urine - per volume
0097110Total Volume
0097111Hours Collected
* Component test codes cannot be used to order tests. The information provided here is not sufficient for interface builds; for a complete test mix, please click the sidebar link to access the Interface Map.
Cross References
  • Hyperoxaluria
  • Oxalate