What is the most probable cause of the patient’s elevated urea nitrogen?

Curren'S Math For Meds: Dosages & Sol
11th Edition
ISBN:9781305143531
Author:CURREN
Publisher:CURREN
Chapter9: Parenteral Medication Labels And Dosage Calculation
Section: Chapter Questions
Problem 4.8P
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An 80-year-old woman was admitted with a diagnosis of hypertension, congestive heart failure, anemia, 
possible diabetes, and chronic renal failure. Her blood workup shows a BUN level of 58 mg/dL and a plasma creatinine of 6.2 mg/dL. What is the most probable cause of the patient’s elevated urea nitrogen?

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