The nurse is caring for a client who is receiving iso-osmolar continuous tube feedings who has developed nausea, vomiting, and tachycardia. Which of the following laboratory results is most important for the nurse to report to the health care provider? A)K+ 3.4 mmol/L B)Ca+² 1.95 mmol/L C)Na+ 128 mmol/L D)PO₄-³ 1.55 mmol/L

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The low serum sodium level is consistent with hyponatremia and the client's symptoms of nausea, vomiting and tachycardia and indicates a need for immediate action to prevent further serious complications such as seizures. The potassium and calcium levels vary slightly from the normal but do not require any immediate action by the nurse. The phosphate level is within the normal parameters.

The Nurse Is Caring for a Client Who Is Receiving