Medicine Fluid & Electrolyte 60f25f21 Which one of the following is the major determinant of plasma osmolality - A Serum sodium B Serum potassium C Blood glucose D Blood urea nitrogen High-Yield Explanation Ans. is 'a' i.e., Serum sodium o Plasma osmolality = 2 (sodium + potassium)+BUN2.8+Blood sugar18