The nurse is preparing to administer the client's daily digoxin with furosemide. The nurse should closely monitor laboratory values for which of the following?

A. Hypercalcemia is not a typical side effect associated with the combination of digoxin and furosemide. B. Hypokalemia is a significant concern when administering digoxin with furosemide because furosemide is a loop diuretic that can lead to potassium loss. Low potassium levels increase the risk of digoxin toxicity. C. Hypocalcemia is not a typical concern with these medications. D. Hyponatremia can occur with furosemide, but it is not the primary concern when monitoring the effects of digoxin.