Renal pathophysiology · Physiology

Which finding is typical of prerenal acute kidney injury?

  1. Elevated urinary sodium concentration above 40 mEq/L
  2. Low blood urea nitrogen with normal creatinine
  3. Low fractional excretion of sodium
  4. Muddy brown granular casts on urine microscopy
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Correct answer: Low fractional excretion of sodium

In prerenal AKI, the kidneys conserve sodium to maintain volume. This results in a low fractional excretion of sodium.

Difficulty: Medium Question 3 of 20

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