Prerenal acute kidney injury is characterized by:

A Kidney stone obstruction

B Decreased renal perfusion leading to elevated BUN/creatinine ratio greater than 20:1 with low fractional excretion of sodium

C Glomerulonephritis

D Drug toxicity

✓ Correct Answer: Option B

Prerenal AKI: decreased renal blood flow (dehydration, CHF, shock). BUN:Cr >20:1, FENa <1%, concentrated urine (high specific gravity). Kidneys are intrinsically normal — respond to volume resuscitation.

💡 Why is B) the correct answer?

The correct answer to the question "Prerenal acute kidney injury is characterized by:" is Option B: Decreased renal perfusion leading to elevated BUN/creatinine ratio greater than 20:1 with low fractional excretion of sodium.

The other options — A) Kidney stone obstruction, C) Glomerulonephritis, D) Drug toxicity — are incorrect for this USMLE Exam Prep question. As explained above: Prerenal AKI: decreased renal blood flow (dehydration, CHF, shock). BUN:Cr >20:1, FENa

📚 About This USMLE Exam Prep Practice Question

This 3-level USMLE Exam Prep question from the Step 2 CK - Clinical Knowledge topic is part of BrainForge Quiz's free exam preparation library. Each question includes the correct answer and a detailed explanation to help you understand the underlying concept, not just memorize the answer.

How to use this page: Read the question above, consider all four options (A through D), then check the highlighted correct answer and explanation. For active timed practice, start a free USMLE Exam Prep practice test or use flashcards for spaced repetition review.

Practice USMLE Exam Prep Quizzes → Browse All Questions Study Flashcards

Prerenal acute kidney injury is characterized by:

✓ Correct Answer: Option B

📚 About This USMLE Exam Prep Practice Question

Related USMLE Exam Prep Questions