A nurse is reviewing the BUN and creatinine levels of an older adult client who has chronic kidney disease. The nurse should expect which of the following findings?

Rationale: A. BUN 45 mg/dL and creatinine 8 mg/dL are elevated values and consistent with chronic kidney disease (CKD). In CKD, the kidneys cannot adequately excrete waste products, leading to accumulation of blood urea nitrogen (BUN) and creatinine. These elevated levels indicate significant renal impairment and reduced glomerular filtration rate (GFR). B. BUN 8 mg/dL and creatinine 0.7 mg/dL are within normal limits (BUN: 7–20 mg/dL; creatinine: 0.6–1.3 mg/dL), suggesting normal kidney function, not CKD. C. BUN 10 mg/dL and creatinine 0.3 mg/dL show a low creatinine level, which may occur in conditions like low muscle mass or malnutrition but not in kidney disease. D. BUN 23 mg/dL and creatinine 1.0 mg/dL indicate a slightly elevated BUN with a normal creatinine, which may be seen in mild dehydration or increased protein intake, but not in chronic renal failure, where both values are significantly elevated.