Mr. Hernandez is a 78-year-old man with a history of hyperte…
Mr. Hernandez is a 78-year-old man with a history of hypertension who presents for his routine follow-up. He is moderately built and reports that he feels well. His physical exam is unremarkable. Recent labs show a serum creatinine of 1.3 mg/dL, which is slightly above the reference range. His creatinine was 1.0 mg/dL one year ago. Which of the following best explains the clinical significance of this finding in an older adult?
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