Oxalate, Urine
Ordering Recommendation

Evaluate individuals with calcium oxalate renal calculi.

Quantitative Spectrophotometry
1-4 days
New York DOH Approval Status
This test is New York DOH approved.
Submit With Order
ARUP Consult®
Disease Topics
Specimen Required
Patient Preparation
Patient should avoid ingestion of vitamin C prior to collection.  
24-hour urine. Refrigerate during collection.  
Specimen Preparation
Thoroughly mix entire collection (24-hour) in one container.  Preserve the specimen as described below.
Freeze specimens immediately after aliquoting. Do not exceed 4 mL in 10 mg Sulfamic Acid tubes.  Contact ARUP Client Services at (800) 522-2787 to order 10 mg Sulfamic Acid tubes used for aliquoting and preservation of the specimen.
Transfer 4 mL aliquot to an ARUP Transport Tube with 20 mg Sulfamic Acid (ARUP supply #48098). Available online through eSupply using ARUP Connector.  Mix well. (Min: 1.5 mL) 
If the collection tube with Sulfamic Acid is not available, transport a 4 mL unadjusted aliquot of urine. (Min: 1.5 mL)  
Storage/Transport Temperature
CRITICAL FROZEN. Separate specimens must be submitted when multiple tests are ordered  
Unacceptable Conditions
Record total volume and collection time interval on transport tube and test request form. This information is required for test interpretation.  
After collection complete: Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month  
Reference Interval
Test Number
Reference Interval
 Creatinine, Urine - per 24h
3-8 years140-700 mg/d140-700 mg/d
9-12 years300-1300 mg/d300-1300 mg/d
13-17 years500-2300 mg/d400-1600 mg/d
18-50 years1000-2500 mg/d700-1600 mg/d
51-80 years800-2100 mg/d500-1400 mg/d
81 years and older600-2000 mg/d400-1300 mg/d

 Oxalate, Urine - per 24h0-12 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.

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.
CPT Code(s)
Component Test Code*Component Chart NameLOINC
0020207Creatinine, Urine - per volume2161-8
0020208Creatinine, Urine - per 24h2162-6
0020255Oxalate, Urine - per 24h2701-1
0020484Oxalate, Urine - per volume27222-9
0097110Total Volume19153-6
0097111Hours Collected30211-7
* 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.
  • Hyperoxaluria
  • Oxalate