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?

A. BUN 23 mg/dL and creatinine 1.0 mg/dL: These values are within or near normal range for an older adult and do not reflect the impaired renal clearance expected in chronic kidney disease. Mild elevation of BUN alone without creatinine elevation is more consistent with dehydration than CKD. B. BUN 45 mg/dL and creatinine 8 mg/dL: Both BUN and creatinine are markedly elevated, which is expected in chronic kidney disease due to reduced glomerular filtration rate and accumulation of nitrogenous waste products. Such levels indicate significant renal impairment. C. BUN 8 mg/dL and creatinine 0.7 mg/dL: These values fall below or within the normal range and do not suggest chronic kidney disease. They reflect adequate kidney filtration and nitrogen waste clearance rather than impaired renal function. D. BUN 10 mg/dL and creatinine 0.3 mg/dL: These levels are lower than expected, which can be seen in conditions such as low muscle mass or malnutrition, but not in chronic kidney disease. CKD typically presents with elevated values, not reduced ones.