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HelpTest Code OSMO Osmolality, Serum
Additional Codes
LAB107
Special Handling
If testing delayed, refrigerate or freeze ASAP to prevent a change in the original osmolality due to evaporation of H2O, decomposition or combination of solutes. Prior to analysis, specimens must equilibrate to room temperature and be gently mixed to aid the complete solution of any precipitated solutes.
Collection Method
Venous collection
Minimum Volume
0.5ml
Container
Gold Top / Serum Separator / Additive Free
Acceptable Specimens
Serum:
- Gold Top SST
- Red Top
Reference or Target Ranges
275-295 mOsm/kg
Reportable Units
mOsm/kg of H2O
Critical Value
≤265mOsm/kg
≥320 mOsm/kg
Reasons for Rejection
| Hemolysis Threshold | No interference |
| Icterus Threshold | Not listed |
| Lipemia Threshold | Not listed |
| Other | QNS, contaminated, improperly labeled, improper specimen type |
Specimen Stability
| Ambient | 3 hours |
| Refrigerated (4°C to 8°C) | 10 hours |
| Frozen(-40°C to 0°C) | 1 week |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time | Stat: 1 hour Routine: 4 hours |
| Stat Availability | Yes |
| Performing Bench | CPH Chemistry |
| Methodology/Method Description | Advanced Instruments Micro-Osmometer Model 3320 – Uses the technique of freezing-point depression to measure osmolality |
CPT Codes
83930
Last review/edit date
Feb 2024