Laboratory Test Information Guide

Details for Oxalate, Random Urine

Test Name: Oxalate, Random Urine
Alternate Name(s):  
Laboratory: Core
Specimen Type: Random urine
(24-hour urine is the preferred sample type; see Lab Test Information Guide entry for Citrate, 24-Hour Urine)
Collection Information: Collect random urine in a sterile container and deliver to the core lab as soon as possible so that acid preservative can be added.

Minimum volume of urine required is 5 mL.

Patient should restrict intake of vitamin C-rich foods and vitamin C supplements for 48 hours prior to urine collection.
Test Schedule: Referred out Monday-Thursday
Turnaround time from when specimen
is received in testing laboratory:
10 days
Reference Range: < 6 months: ≤ 0.37 mmol/mmol creatinine
6-24 months: ≤ 0.26 mmol/mmol creatinine
2-5 years: ≤ 0.14 mmol/mmol creatinine
6-12 years: ≤ 0.08 mmol/mmol creatinine
> 18 years: ≤ 0.04 mmol/mmol creatinine
Effective Date: 2018-01-15
Revised Date: 2020-06-22
Critical Value:  
Interpretive Comments: High values are found in primary hyperoxaluria, diseases of the distal ileum, pyridoxine deficiency, and ethylene glycol poisoning. Consumption of oxalate-rich foods (e.g. rhubarb, strawberries, spinach, and tomatoes) may increase excretion.
Special Processing: Add 4 drops of 6 N HCl to random urine collection. Final pH should be 1-3.
Method of Analysis: Enzymatic
Critical Information Required:  
Storage & Shipment: Store and ship frozen.
System Codes: 
Referred To: In-Common Laboratories

Questions? Comments? Contact Laura Gopaul