An Older Adult Patient with Congestive Heart Failure Develops Crackles

An older adult patient with congestive heart failure develops crackles in both lungs and pitting edema of all extremities. The physician orders hydrochlorothiazide [HydroDIURIL]. Before administering this medication, the nurse reviews the patient's chart. Which laboratory value causes the nurse the most concern?

A) Elevated creatinine clearance
B) Elevated serum potassium level
C) Normal blood glucose level
D) Low levels of low-density lipoprotein (LDL) cholesterol

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