Physiology Renal physiology daf89611 The normal plasma osmolality (mOsmol/kg) is A 240-255 B 260-275 C 285-295 D 300-312 High-Yield Explanation Normal human reference range of osmolality in plasma is about 285-295 milli-osmoles per kilogram.Ref: Ganong&;s review of medical physiology; 24th edition; page no; 310