Take a look at some initial diagnostic testing below.
Urinalysis/microscopy, urine electrolytes 
Urine sediment
The urine sediment is bland, with rare WBCs, rare non-dysmorphic RBCs, and no casts.
Basic labs
Kidney Ultrasound
You discover that patient’s baseline creatinine is 0.8 mg/dL. She is currently making 20 mL of urine per hour.
What is highest on your differential diagnosis for this patient’s acute kidney injury?
Acute interstitial nephritis (AIN)
Hypovolemia
Cardiorenal syndrome
Hepatorenal syndrome
Thrombotic microangiopathy (TMA)
Congestive heart failure
Acute tubular necrosis (ATN)
Rapidly progressive glomerulonephritis (RPGN)
Urinary tract obstruction
Nephrotic syndrome
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Case 26 Index
Case 26 Introduction
Case 26 Physical Exam