You are asked to consult on a patient who is hospitalized by an orthopedic surgeon. The patient is a 25-year-old female who has a history of osteomyelitis from an open fracture sustained in a skiing accident. She has recently begun to spike a fever and have a rapid increase in her creatinine.

• Medications: Methicillin, ibuprofen, morphine PDA
• Labs: Cr = 3.5mg/dl, BUN = 25 mg/dl
• CBC shows mild eosinophilia.

1		All things being equal, what would you expect to find?
			A)	FENA > 2%, Urine Sodium < 20.
			B)	FENA < 1%, Urine Sodium < 20.
			C)	FENA > 2%, Urine sodium > 40.
			D)	FENA < 1%, Urine sodium > 40.
2		The patient’s exam shows a diffuse rash and the urine contains white cell casts. The most likely diagnosis is:
			A)	ATN.
			B)	Interstitial nephritis.
			C)	Renal infarction.
			D)	Glomerulonephritis.
			E)	Nephrotic syndrome.
3		How long after drug exposure does interstitial nephritis generally begin?
			A)	2–3 days.
			B)	10–14 days.
			C)	Several months.
			D)	A and B.
			E)	All of the above.