A client is currently prescribed pantoprazole, and the nurse is reviewing the client's labs (shown below). Which lab result is of most concern to the nurse? Laboratory Test Result Normal Range Sodium 146 mEq/dL 135-145 mEq/L Calcium 8.2 mg/dL 8.4-10.2 mg/dL Magnesium 1.2 mg/dL 1.6-2.2 mg/dL Gastric pH 6 1-4