Interactive Serum Osmolality calculator. Requires the calculator gadget.
Usage: {{Serum Osmolality Calculator}}
Calculated Serum Osmolality
Calculated Serum Osmolality
| Parameter
|
Value
|
| Sodium (mEq/L)
|
|
| BUN (mg/dL)
|
|
| Glucose (mg/dL)
|
|
| Calculated Osm
|
mOsm/kg
|
Interpretation
| 275–295
|
Normal serum osmolality.
|
- Osmolal gap = Measured Osm – Calculated Osm. Gap >10 suggests unmeasured osmoles (toxic alcohols, mannitol, etc.).
|
References
- Formula: Osm = 2×Na + BUN/2.8 + Glucose/18
- Purssell RA, et al. Derivation and validation of a formula to calculate the contribution of ethanol to the osmolal gap. Ann Emerg Med. 2001;38(6):653-659. PMID 11719745.
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