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HelpTest Code Osmolal Gap Osmolal Gap
Additional Codes
BMP, ETOH, BOHB, OSMO
Patient Preparation
No special patient preparation required
Collection Method
Venous collection
Minimum Volume
See individual test components
Container
Light Green (Lithium Heparin)
Preferred Specimen
Light Green Top (Lithium Heparin)
Acceptable Specimens
Serum:
- Gold Top SST
- Red Top
Plasma:
- Light Geen Top (Lithium Heparin)
Reference or Target Ranges
| Osmolal Gap < 10 |
Reportable Units
mOsm/kg of H2O
Critical Value
N/A
Reasons for Rejection
| Hemolysis Threshold | See individual tests |
| Icterus Threshold | See individual tests |
| Lipemia Threshold | See individual tests |
| Other | N/A |
Specimen Stability
| Ambient | See individual tests |
| Refrigerated (4°C to 8°C) | See individual tests |
| Frozen(-40°C to 0°C) | See individual tests |
Performance Information
| Days and Time Performed | 24/7 |
| Expected Turn Around Time | Stat: 1 hour |
| Stat Availability | Yes |
| Performing Bench | UH Chemistry |
| Methodology/Method Description | Roche Cobas - see individual tests . Advanced Instruments Micro-Osmometer - freezing point depression |
CPT Codes
80048, 82077, 82010, 83930
Additional Information / Important Notes
The osmolal gap calculation is useful for assessment of:
1) volatile substance
2) ethylene glycol ingestion
3) alcoholic ketoacidosis
4) diabetic hyperosmolar syndrome.
This order set includes the osmolal gap calculation and several analytes that are helpful for clinical differentiation.