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HelpTest Code 24NA Sodium, urine, 24 hr
Laboratory Code
LAB446
Specimen Requirements
Specimen Type: 24 hr urine
Container/Tube: The following types of 24 hr urine containers are acceptable:
- No preservatives
- 3.0 g Thymol
Volume: 4000.0 mL
Minimum Volume: 20.0 mL
Collection Instructions: Collect urine in 24 hr urine container with a suitable preservative (available at laboratory).
Please refer to NUH's Urine Preservative Guide
Specimen Stability
| Specimen Type | 24 hr urine |
|---|---|
| Ambient | 45 days |
| Refrigerate | 45 days |
| Frozen | 1 year |
Methodology
Potentiometry
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Haemolysis | Not applicable |
|---|---|
| Icterus | Not applicable |
| Lipaemia | Not applicable |
| Others | Not applicable |
Reference Interval
| Age | Male | Female |
|---|---|---|
| 6 – 9 yrs | 41 – 115 mmol/day | 20 – 69 mmol/day |
| 10 – 13 yrs | 63 – 177 mmol/day | 48 – 168 mmol/day |
| ≥ 18 yrs | 40 – 220 mmol/day | 27 – 287 mmol/day |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessment of electrolyte balance.
Service Code
31142
LOINC Code Information
| Urine volume, total | 3167-4 |
|---|---|
| Sodium, urine | 2955-3 |
| Sodium, urine, 24 hr | 2956-1 |
Alias
24NA
Update
Last updated 12/03/2025