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Review Question - QID 212792

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QID 212792 (Type "212792" in App Search)
A 51-year-old African American man presents to his primary care physician’s office for an annual visit. He has no major concerns and says that he has been healthy for the last year. His past medical history is significant for diabetes as well as long standing hypertension that has developed gradually since his 30's; however, he has refused to take any medications. Physical exam shows no abnormal findings. Routine laboratory testing reveals the following:

Serum creatinine concentration: 1.5 mg/dL
Blood urea nitrogen: 31 mg/dL

Based on these results, urine studies are conducted that reveal mild proteinuria of less than 1 g/day and no casts.

Which of the following is most likely associated with the cause of this patient's elevated creatinine?