What is the normal range of serum potassium levels in adults?

• A. 2.5-3.5 mEq/L
• B. 3.5-4.5 mEq/L
• C. 3.5-5.0 mEq/L
• D. 4.0-5.5 mEq/L

Answer: (C)

Potassium is a crucial electrolyte in the body, playing an essential role in various physiological functions, including nerve transmission, muscle contraction, and maintaining fluid balance. The normal range for serum potassium levels in adults is typically recognized as 3.5 to 5.0 mEq/L. This range is significant for ensuring proper cellular function and overall homeostasis.

Values below this range can indicate hypokalemia, which can lead to arrhythmias and muscle weakness, among other symptoms, while values above this range indicate hyperkalemia, which can be dangerously high in acute cases and affect heart function.

Understanding this normal range helps in diagnosing electrolyte imbalances that can result from various medical conditions, medications, or dietary habits. It's essential for health professionals to recognize these levels to provide appropriate interventions if abnormalities are detected.