Laboratory Testing Is Ordered for a Patient During a Clinic

Laboratory testing is ordered for a patient during a clinic visit for routine assessment of hypertension. When monitoring for target organ damage, the nurse will be most concerned about

A) blood urea nitrogen (BUN) of 15 mg/dl (5.4 mmol/L) .
B) serum hemoglobin of 14.7 g/dl (135 g/L) .
C) serum creatinine of 2.6 mg/dl (230 mmol/L) .
D) serum potassium of 3.8 mEq/L (3.2 mmol/L) .