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Test Code 24OXA Oxalate, urine, 24 hr

Important Note

Urine must be acidified with 6N HCL OR, preserved with 3.0 g Thymol during collection. Please collect 24 hr urine bottle from Clinical Chemistry.

Laboratory Code

LAB421

Specimen Requirements

Specimen Type: 24 hr urine

Container/Tube: The following types of 24 hr urine containers are acceptable:

  • 6N HCL
  • 3.0 g Thymol

 

Volume: 4000.0 mL

Minimum volume: 20.0 mL urine

Collection Instructions: Urine must be acidified with 6N HCL OR 3.0 g Thymol during collection. Dietary and/or drug restrictions apply.
 

Please refer to NUH's Urine Preservative Guide

Specimen Stability

Specimen Type 24 hr urine
Ambient Not available
Refrigerate 1 week (preferred)
Frozen 1 month

Methodology

Spectrophotometry

Days and Times Performed

Friday, TAT 2 - 8 days

Specimen Condition

Haemolysis Not applicable
Icterus Not applicable
Lipaemia Not applicable
Others: Urine not preserved with 6N HCL OR 3.0 g Thymol during collection Reject 

Reference Interval

Age Male Female
0 to < 18 yrs (per m2 BSA) 

< 0.5 mmol/day/1.73m2
≥ 18 yrs 0.08 – 0.49 mmol/day 0.04 – 0.32 mmol/day

Testing Laboratory

National University Hospital
Clinical Chemistry, 67724399

Useful For

Investigation of renal calculi

Service Code

31973

LOINC Code Information

Oxalate, urine, 24 hr 14862-7
Oxalate, urine 15086-2
Urine volume, total 3167-4

Update

Last updated 07/02/2025