Potassium is the primary intracellular electrolyte. The normal serum potassium is 3.5 to 5.0 mEq/L. Having too little potassium (less than 3.5 mEq/L) is called hypokalemia, while having too much (more than 5.5 mEq/L) is called hyperkalemia. Hypokalemia is one of the most common electrolyte disorders. It clinically defined as a serum potassium level of less than 3.5 mEq/L. Moderate hypokalemia is a serum level of 2.5 to 3.0 mEq/L; severe hypokalemia is a serum level of less than 2.5 mEq/L (although life-threatening hypokalemia is rare).

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