The nurse is reviewing laboratory results for a client with prolonged nasogastric suctioning. Which finding warrants immediate attention?

✓ Correct Answer: Option B

Prolonged nasogastric suctioning can lead to significant loss of potassium, causing hypokalemia. A potassium level of 2.9 mEq/L is critically low and can cause life-threatening cardiac dysrhythmias and muscle weakness, requiring immediate intervention.