Molecular weight of propylene glycol: 76.08 g
predicted osmolal gap in mOsm per Kg H2O =
= (2 * (serum sodium concentration in mEq/L)) + ((serum glucose in mg/dL) / 18) + ((serum BUN in mg/dL) / 2.8)
osmolal gap =
= (measured osmolal gap) – (predicted osmolal gap)
Equation of Glasgow et al
propylene glycol in mg/dL =
= (9.2 * (osmolal gap)) + 47.5
Equation of Fligner et al
predicted osmolal gap in mOsm per Kg H2O =
= (1.86 * (serum sodium concentration in mEq/L)) + ((serum glucose in mg/dL) / 18) + ((serum BUN in mg/dL) / 2.8)
osmolal gap =
= (measured osmolal gap) – ((predicted osmolal gap) / 0.93)
propylene glycol in mg/dL =
= (7.8 * (osmolal gap)) + 84.6
Based on Chemical Formula
propylene glycol in mg/dL =
= (osmolal gap) * 7.6
propylene glycol in mmol/L =
= (osmolal gap)