Chronic Kidney Disease USMLE Step 1 Practice Question
A 75 year old nursing home resident is brought in for confusion after several days of poor oral intake. Blood pressure is 88/54 mm Hg. Creatinine is mildly elevated. His urine sodium is very low and his calculated fractional excretion of sodium is 0.4 percent. Which of the following is the most likely diagnosis?
Answer choices
- AAcute tubular necrosis
- BAcute interstitial nephritis
- CPrerenal azotemiaCorrect answer
- DRapidly progressive glomerulonephritis
- EPostrenal obstruction
- FContrast-induced nephropathy following recent iodinated contrast administration
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