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HelpTest Code OSMS Osmolality, serum
Laboratory Code
LAB107
Specimen Requirements
Submit only one of the following:
Preferred
Specimen Type: Serum
Container/Tube: Gold Top (SSTII) / Red Top
Volume: 5.0 mL / 6.0 mL
Minimum Volume: 0.5 mL serum
Collection Instructions: Allow specimen to clot for 30 mins and centrifuge within 2 hrs.
Acceptable
Specimen Type: Plasma
Container/Tube: Green Top (Li Heparin/PST)
Volume: 4.5 mL
Minimum Volume: 0.5 mL plasma
Collection Instructions: Centrifuge within 2 hrs.
Specimen Stability
| Specimen Type | Serum/Plasma |
|---|---|
| Ambient | 36 hours |
| Refrigerate | 36 hours |
| Frozen | 6 months |
Methodology
Freezing-point Depression
Days and Times Performed
24 hrs, TAT 1 day
Specimen Condition
| Haemolysis | Not available |
|---|---|
| Icterus | Not available |
| Lipaemia | Not available |
| Others | Not available |
Reference Interval
275 – 300 mOsm/Kg
Testing Laboratory
National University Hospital
Clinical Chemistry, 67724346
Useful For
Assess fluid and electrolyte balance.
Service Code
31307
LOINC Code Information
2692-2
Update
Last updated 11/03/2025