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Which laboratory value should a nurse monitor in a client receiving furosemide?

  1. Sodium

  2. Calcium

  3. Potassium

  4. Hemoglobin

The correct answer is: Potassium

A nurse should monitor potassium levels in a client receiving furosemide because this medication is a loop diuretic that works by increasing the excretion of water and electrolytes, including potassium. Clients taking furosemide may experience hypokalemia (low potassium levels) which can lead to weakness, confusion, and cardiac dysrhythmias. While monitoring all lab values is important, sodium, calcium, and hemoglobin levels are not directly affected by furosemide. Therefore, monitoring potassium levels is the most pertinent in this scenario.