EEvigradeRU

Calculated Serum Osmolality

Calculated serum osmolality for fluid-electrolyte disorders and osmolal gap assessment.

Unit system

mmol/L
mmol/L
mmol/L (urea)

About this calculator

An osmolal gap (measured minus calculated osmolality) >10 mOsm/kg suggests unmeasured osmoles (toxic alcohols, mannitol).

Source

Purssell RA, Pudek M, Brubacher J, Abu-Laban RB. Derivation and validation of a formula to calculate the contribution of ethanol to the osmolal gap. Ann Emerg Med. 2001;38(6):653-659.

Formula version: 2024-v1