A nurse is reinforcing teaching with the parent of an infant who is receiving furosemide. The nurse should reinforce with the parent that which of the following laboratory tests will be monitored while the infant is receiving this medication?

A. Potassium: Furosemide is a loop diuretic that increases renal excretion of sodium, chloride, and water, which can lead to significant potassium loss. Monitoring serum potassium levels is essential to prevent hypokalemia, which can cause muscle weakness, arrhythmias, and cardiac complications, especially in infants who are more vulnerable to electrolyte imbalances. B. WBC count: Furosemide does not typically affect white blood cell production or immune function. Monitoring WBC count is not indicated solely for furosemide therapy unless the infant has another condition that requires hematologic surveillance. C. Iron: Furosemide does not interfere with iron metabolism or absorption. Iron studies are unrelated to diuretic therapy and are not required unless the infant has known anemia or is receiving iron supplementation for another reason. D. Amylase: Amylase is a pancreatic enzyme monitored in cases of pancreatic disorders or suspected pancreatitis. Furosemide therapy does not directly affect pancreatic function, so amylase measurement is not indicated as part of routine monitoring for this medication.