Oxalate (Urine)

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Testing Laboratory

Auckland Te Toka Tumai | Auckland Hospital

Department

Refer to Testing Lab link

Delphic Registration Code (Alpha Code)

UOXX, UR24

Test Code (Numeric Code)

7844

Laboratory Handling

Phlebotomy

Casual urine, only accepted on children

Registration

Register additional code UR24 if the collect is a 24 hr urine. Give to biochem with copy of request form

Laboratory

For Casual urine, Biochemistry will add acid to the sample before sending to LabPlus. Store and transport frozen

Sample Stability

The sample should be acidified within 6 hours of completion by the receiving laboratory. Casual sample may be received from children ≤15 yr of age and should be acidified upon receipt by the laboratory.

Turnaround Time

2 weeks

Performed once a week

Specimen Type

  • 24hr Urine

Specimen Requirements

Tube/Container Type:

Preferred
  • Acidified 24hr Urine Container
Preferred
  • 24hr Urine Container
Acceptable
  • BD Urine Tube (no additive)
  • Specimen Container
Minimum Sample Volume (ml)

10

Paediatric Specimen Requirements

Tube/Container Type:

Preferred
  • Acidified 24hr Urine Container
Acceptable
  • BD Urine Tube (no additive)
  • Specimen Container
Minimum Sample Volume (ml)

5

Pre-testing Requirements

Samples for urine and plasma oxalate testing should be obtained when the patient is not on pyridoxine or other vitamin supplements. These can interfere with the measurement and should be stopped for 24-48hrs prior.

Last updated: 13/11/2026