A client reports a 2-day history of fever, vomiting, and diarrhea. The healthcare provider prescribes serum electrolyte levels to be obtained. Reference Range: Potassium (K+): 3.5 to 5.0 mEq/L (3.5 to 5.0 mmol/L) Sodium (Na+): 136 to 145 mEq/L (136 to 145 mmol/L) Which laboratory results should the nurse expect?