Are you ready for the NCLEX?What is the normal potassium level in adult blood serum?36%Next Correct Incorrect Normal adult serum potassium ranges from 3.5 to 5.0 mEq/L. What is the normal potassium level in adult blood serum? 2.53.0 mEq/L 1.52.5 mEq/L 5.56.5 mEq/L 3.55.0 mEq/L 36%