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HelpTest Code OSMS Osmolality, serum
Additional Codes
| Epic Ordering Code | LAB107 |
| NBS code | LBC04637 |
| Service code | 31307 |
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: 0.5 mL
Specimen Stability
| Specimen Type | Serum/Plasma |
|---|---|
| Ambient | 36 hours |
| Refrigerate | 36 hours |
| Frozen | 6 months |
Specimen Condition
| Haemolysis | Not available |
|---|---|
| Icterus | Not available |
| Lipaemia | Not available |
| Others | Not available |
Methodology
Freezing-point Depression
Days and Times Performed
24 hrs, TAT 1 day
Reference Interval
275 – 300 mOsm/Kg
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assess fluid and electrolyte balance.
Update
Last updated 26/07/2026
LOINC Code Information
2692-2