What is the normal range for serum potassium levels?

The normal range for serum potassium levels is typically recognized as 3.5 to 5.0 mEq/L. This range is important because potassium plays a critical role in various physiological functions, including the regulation of heart rhythm, muscle contraction, and nerve transmission. Maintaining potassium levels within this range is crucial for preventing both hypokalemia (low potassium levels) and hyperkalemia (high potassium levels), both of which can lead to serious health complications.

In clinical practice, serum potassium levels are monitored especially in patients with conditions that may disrupt electrolyte balance, such as chronic kidney disease, certain medications, and metabolic disorders. Understanding that 3.5 to 5.0 mEq/L constitutes the normal range helps healthcare professionals interpret lab results and make informed decisions about treatment plans.