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HelpTest Code 24MG Magnesium, urine, 24 hr
Laboratory Code
LAB406
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 | 2 days |
| Refrigerate | 2 days |
| Frozen | 1 year |
Methodology
Enzymatic Assay
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
3.0 – 5.0 mmol/day
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessment of the cause of abnormal serum magnesium concentrations.
Service Code
31306
LOINC Code Information
| Urine volume, total | 3167-4 |
|---|---|
| Magnesium, urine | 2598-1 |
| Magnesium, urine, 24 hr | 2599-9 |
Alias
24MG
Update
Last updated 11/03/2025