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HelpTest Code MG Magnesium
Additional Codes
| Epic Ordering Code | LAB103 |
| NBS code | LBC00636 |
| Service code | 31305 |
Specimen Requirements
Submit only one of the following:
| Preferred: | Acceptable: |
| Yellow Top | Light Green Top |
Processing Requirements
Allow specimen to clot for 30 mins (Yellow Top) and centrifuge within 2 hours
Specimen type: Serum/Plasma
Volume: 0.5mL
Specimen Stability
| Specimen Type | Serum/Plasma |
|---|---|
| Ambient | 8 hours |
| Refrigerate | 3 days |
| Frozen | 3 months |
Specimen Condition
| Haemolysis | OK |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Methodology
Enzymatic Assay
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
| Age | |
|---|---|
| 1 wk – 17 yrs | 0.65 – 1.10 mmol/L |
| ≥ 18 yrs | 0.70 – 1.10 mmol/L |
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Determine deficiency or excess states.
Update
Last updated 26/07/2026
LOINC Code Information
2601-3