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HelpTest Code K Potassium, serum
Additional Codes
| Epic Ordering Code | LAB114 |
| NBS code | LBC04820 |
| Service code | 31112 |
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 | 7 days |
| Refrigerate | 7 days |
| Frozen | 1 year |
Specimen Condition
| Haemolysis | Alert/Reject |
|---|---|
| Icterus | OK |
| Lipaemia | OK |
| Others | Not applicable |
Methodology
Potentiometry
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
| 0 – < 1 mth | 3.6 – 6.0 mmol/L |
|---|---|
| 1 mth – < 1 yr | 3.6 – 5.8 mmol/L |
| 1 – 14 yrs | 3.5 – 5.5 mmol/L |
| ≥ 15 yrs | 3.5 – 5.2 mmol/L |
Critical Value: <2.5 mmol/L or > 6.0 mmol/L
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assessment of electrolyte balance.
Update
Last updated 27/07/2026
LOINC Code Information
2823-3