Template:Serum Osmolality Calculator: Difference between revisions

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* '''Osmolal gap''' = Measured Osm – Calculated Osm. Gap >10 suggests unmeasured osmoles (toxic alcohols, mannitol, etc.).
* '''Osmolal gap''' = Measured Osm – Calculated Osm. Gap >10 suggests unmeasured osmoles ([[Toxic alcohols|toxic alcohols]], mannitol, etc.).
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Latest revision as of 16:53, 21 March 2026

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.