| Ordering Code | 463 |
|---|---|
| Test Name | Osmolality |
| Alias | Serum Osmolality |
| Preferred Specimen | Plasma |
| Preferred Container | Lithium Heparin PST (Green) |
| Other Specimen/Container | Plasma in Lithium Heparin (Green), Serum in Plain (Red), Serum in SST (Gold) |
| Optimum Volume | 2 mL |
| Handling Instructions | Centrifuge & aliquot specimen immediately. |
| Transport Requirements | Oahu: Refrigerated Airline: Refrigerated |
| Specimen Stability | Ambient: 48 Hours Refrigerated: 1 Week |
| Rejection Criteria | Contaminated, Insufficient quantity, Specimen older than stability limits |
| Avail. Stat | YES |
| Analytic Time | 1 Day |
| Methodology | Freezing point depression |
Reference range(s)
The reference ranges listed below are valid on this date of November 22, 2025.
| Component | Age | Male Norm | Male Critical Low | Male Critical High | Female Norm | Female Critical High | Female Critical Low | Units | Add'l info |
|---|---|---|---|---|---|---|---|---|---|
| Osmolality | ALL | 280-300 | 280-300 | mOsm/kg |
