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HelpTest Code NA Sodium, serum
Additional Codes
| Epic Ordering Code | LAB122 |
| NBS code | LBC04917 |
| Service code | 31111 |
Specimen Requirements
Submit 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 | 2 weeks |
| Refrigerate | 2 weeks |
| Frozen | 1 year |
Specimen Condition
| Gross Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Methodology
Potentiometry
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
| Age | |
|---|---|
| 0 – < 1 wk | 132 – 147 mmol/L |
| 1 wk – 17 yrs | 133 – 144 mmol/L |
| ≥ 18 yrs | 135 – 145 mmol/L |
Critical Value: <120 mmol/L or >160 mmol/L
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessment of electrolyte balance.
Update
Last updated 28/07/2026
LOINC Code Information
2951-2