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?

Choice A reason: BUN of 45 mg/dL and creatinine of 8 mg/dL are significantly elevated and consistent with chronic kidney disease. These values reflect impaired renal filtration and accumulation of nitrogenous waste products. Such levels are typical in advanced stages of CKD and require ongoing management, including dialysis in end-stage cases. Choice B reason: BUN of 10 mg/dL and creatinine of 0.3 mg/dL are below normal and may suggest overhydration or laboratory error. These values are not consistent with CKD and would not be expected in an older adult with renal impairment. Choice C reason: BUN of 8 mg/dL and creatinine of 0.7 mg/dL are within normal limits and do not reflect chronic kidney disease. These values may be seen in healthy individuals or those with well-controlled renal function. Choice D reason: BUN of 23 mg/dL and creatinine of 1.0 mg/dL are mildly elevated but not diagnostic of CKD. They may indicate early renal changes or dehydration but are not representative of advanced disease.