The nurse is monitoring the results of Mario's serum laboratory studies. The nurse should alert the primary health care provider regarding which test result?
• Serum osmolality 288mOsm/kg ( 288 mmol/kg )
• Potassium 3.1 mEq/L (3.1 mmol/L )
• Sodium 137 mEq/L(137 mmol/L)
• Calcium 9.2 mg/dL(2.3 mmol/L)