The nurse is caring for an elderly client who presents to the ED with poor appetite, confusion, and weakness. Lab work is ordered for the client. The nurse should immediately notify the health care provider for which lab result?

Number 3 is correct.

The normal sodium range is 135 to 145 mEq/L. Levels below 120 mEq/L are critical and may lead to death if left untreated. The values given for chloride, calcium, and potassium are within the normal range and do not require treatment.