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HelpTest Code LAB107 Osmolality, Serum
Useful For
- Determining the number of solutes present in serum and urine
- Evaluating the body's water balance or its ability to produce and concentrate urine
- Investigating low sodium levels
- Detecting the presence of toxins such as methanol and ethylene glycol
- Monitoring osmotically active drug therapies such as mannitol, used to treat cerebral edema
- Monitoring the effectiveness of treatment for any conditions found to be affecting a person's osmolality
Methodology
Freezing Point Depression
Performing Laboratory
Bozeman Health Laboratory Services
Specimen Requirements
Specimen Type: Serum
Container/Tube: Red top or gold top
Specimen Volume: 2 mL
Specimen Minimum Volume: 1 mL
Specimen Transport Temperature
Ambient
Specimen Stability
| Specimen Type | Temperature | Time |
|---|---|---|
| Serum | Ambient | 4 hours |
| Refrigerated | 5 days | |
| Frozen | 6 months |
Reference Values
| Age | Reference Values |
|---|---|
| 0-7 days | 275-300 mOsm/kg |
| 7-28 days | 276-305 mOsm/kg |
| 28 days-2 months | 274-305 mOsm/kg |
| >2 months | 275-295 mOsm/kg |
Day(s) Test Set Up
Monday through Sunday
Test Classification and CPT Coding
83930