Certified Nephrology Nurse Certification (CNN) 2025 – 400 Free Practice Questions to Pass the Exam

The recommended normal serum potassium level in adults is 3.5 to 5.0 mEq/L. This range is established based on the physiological needs of the body, as potassium is a crucial electrolyte that plays a significant role in various bodily functions, especially in maintaining proper nerve and muscle function, including cardiac function.

Maintaining potassium levels within this range is vital because both low levels (hypokalemia) and high levels (hyperkalemia) can lead to serious health consequences. Hypokalemia can cause muscle weakness, cramps, and arrhythmias, while hyperkalemia can lead to potentially life-threatening cardiac problems.

The other ranges presented are not aligned with established medical guidelines for normal serum potassium levels. Specifically, levels below 3.5 mEq/L indicate a deficiency, while levels above 5.0 mEq/L can indicate an excess, both of which warrant clinical attention and intervention. Understanding the correct ranges for serum potassium is essential for recognizing and managing potential electrolyte imbalances in patients.