Normal plasma osmolality in mOsmol/kg H2O: (A) 290, (B) 385, (C) 485, (D) 585
Answer is A. The osmolarity is the number of osmoles per litre of solution The freezing point of normal human plasma averages -0.54 degC, which corresponds to an osmolal concentration in plasma of 290 mOsm/L Ref: Ganong's Review of Medical Physiology Twenty-Third Edition Page No:6