What is the normal range for Potassium?

What is the normal range for Potassium?

• A. 3.0-4.5 mEq/L
• B. 3.5-5.0 mEq/L
• C. 4.0-5.5 mEq/L
• D. 2.5-4.5 mEq/L

Answer: (B)

Potassium balance is essential for nerve and muscle function, especially the heart, and the normal adult serum potassium level is kept within a narrow window by the kidneys. The range commonly used in practice is about 3.5 to 5.0 mEq/L. Values below this can indicate hypokalemia, which may cause muscle weakness, cramping, and potentially dangerous heart rhythm changes. Values above this can indicate hyperkalemia, which raises the risk of life-threatening arrhythmias. So, this range best reflects the healthy physiologic window and helps clinicians identify when potassium is outside safe limits. Other ranges that start below 3.5 would miss early low potassium, while those extending above 5.0 could miss or delay recognizing high potassium.

Potassium balance is essential for nerve and muscle function, especially the heart, and the normal adult serum potassium level is kept within a narrow window by the kidneys. The range commonly used in practice is about 3.5 to 5.0 mEq/L. Values below this can indicate hypokalemia, which may cause muscle weakness, cramping, and potentially dangerous heart rhythm changes. Values above this can indicate hyperkalemia, which raises the risk of life-threatening arrhythmias. So, this range best reflects the healthy physiologic window and helps clinicians identify when potassium is outside safe limits. Other ranges that start below 3.5 would miss early low potassium, while those extending above 5.0 could miss or delay recognizing high potassium.