What is the normal serum potassium level range for adults?

• A. 1.5 to 3.0 mEq/L
• B. 4.0 to 6.0 mEq/L
• C. 3.5 to 5.0 mEq/L
• D. 2.5 to 4.5 mEq/L

Answer: (C)

The normal serum potassium level range for adults is typically considered to be between 3.5 to 5.0 mEq/L. This range is critical for maintaining various physiological functions in the body, including muscle contraction, nerve transmission, and maintaining fluid balance.

Potassium is an essential electrolyte, and even minor deviations from this normal range can lead to significant health issues. For instance, levels below 3.5 mEq/L can indicate hypokalemia, which can lead to muscle weakness, cardiac arrhythmias, and other serious complications. Conversely, levels above 5.0 mEq/L signify hyperkalemia, which can also have dangerous sequelae, particularly affecting heart rhythm.

This established normal range is widely accepted within the medical community and underlines the importance of monitoring potassium levels to ensure proper metabolic function and overall health.