Prescribing Safety Assessment (PSA) Practice Exam

What is the normal range for serum potassium levels?

1. 2.5-3.5 mmol/L

2. 3.5-5.0 mmol/L

3. 5.0-6.5 mmol/L

4. 6.5-7.5 mmol/L

The correct answer is: 3.5-5.0 mmol/L

The normal range for serum potassium levels is typically recognized as being between 3.5 and 5.0 mmol/L. This range is critical for several physiological processes, including muscle contraction and nerve function, making it essential for maintaining overall health. The body tightly regulates potassium levels, as both hypokalemia (low potassium) and hyperkalemia (high potassium) can lead to serious health issues, including cardiac arrhythmias. The range of 3.5-5.0 mmol/L has been established through clinical research and is widely accepted in medical guidelines. It indicates sufficient potassium for physiological functioning without posing a risk of the potential complications associated with levels above or below this range.