Hyponatremia Nursing Action in Heart Failure

A 58-year-old female patient with a history of chronic heart failure is admitted to the hospital with worsening dyspnea and fatigue. The healthcare provider orders a panel of laboratory tests, including serum electrolytes and renal function tests. While reviewing the patient's laboratory results, the nurse notes a serum sodium level of 120 mEq/L. What is the most appropriate nursing action based on this laboratory value?