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.
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. 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.

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.


After collection complete: Ambient: Unacceptable; Refrigerated: Unacceptable; Frozen: 1 month

Reference Interval
Test Number
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, 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

Interpretive Data

Compliance Category



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.

Hotline History
CPT Codes


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
0097110 Total Volume 19153-6
0097111 Hours Collected 30211-7
* 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
Oxalate, Urine