What is the normal serum potassium level range?

The normal serum potassium level range is essential for various physiological processes, including nerve function, muscle contraction, and maintaining proper heart rhythms. A normal serum potassium level typically falls between 3.5 and 5.0 mEq/L.

This range is important because levels below or above this can lead to significant clinical issues. For example, levels below 3.5 mEq/L can result in hypokalemia, causing muscle weakness, cramping, and potentially life-threatening arrhythmias. Conversely, levels above 5.0 mEq/L can lead to hyperkalemia, which also poses a risk for serious cardiac complications.

The other ranges listed either extend too low or too high compared to the established normal range for potassium in serum, reflecting an inaccurate understanding of the physiological balance of this critical electrolyte in the body.