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HelpTest Code 24OXA Oxalate, urine, 24 hr
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