Two hours before a client's scheduled surgery, the nurse is completing the preoperative checklist. Which information requires immediate action by the nurse? Reference Range: Potassium [3.5 to 5 mEq/L (3.5 to 5 mmol/L)] .

A. The surgical consent form is crucial for ensuring that the client is informed about the procedure and agrees to it. While it's critical for legal and ethical reasons, this issue can often be resolved relatively quickly by having the client sign the form or addressing it with the surgeon. B. A pulse oximeter reading of 96% indicates that the client's oxygen saturation is within a generally acceptable range (normal is usually 95% to 100%). This reading suggests that the client's oxygen levels are adequate and typically would not require immediate action. C. The absence of a preoperative chest x-ray report can be significant, especially if the client has underlying respiratory or cardiac conditions. However, the immediate need for action depends on the urgency and the reason the x-ray was ordered. D. A serum potassium level of 2.8 mEq/L is critically low. The normal reference range is 3.5 to 5 mEq/L. Hypokalemia (low potassium) can lead to severe complications, including cardiac arrhythmias and muscle weakness, which can significantly impact the client's ability to safely undergo surgery. This condition requires immediate attention to correct the electrolyte imbalance before proceeding with the surgical procedure.