A client has a serum potassium level of 6.5 mEq/L (6.5 mmol/L), a serum creatinine level of 2 mg/dL (176 mcmol/L), and a urine output of 350 mL/day. What is the priority action by the nurse?

Continue to monitor the client's intake and output.

Teach the client to limit high-potassium foods.

Ask to have the laboratory redraw the blood specimen.

Place the client on a cardiac monitor immediately.