Question: A 60-year-old woman is admitted to the hospital for cholecystitis. She undergoes an uncomplicated laparoscopic cholecystectomy. She receives 2.5 L of normal saline during the case. Her medical history is notable for diabetes mellitus and obesity. She does not use tobacco, alcohol or drugs. 12 hours after the surgery, her urine output is 50 cc total. Her temperature is 99.5°F, pulse is 83/min, and blood pressure is 114/80 mmHg. The patient's abdominal port incisions are clean, dry, and intact. She has mild right upper quadrant tenderness without rebound or guarding. Laboratory studies show creatinine that increased from 1.0 mg/dL to 1.4 mg/dL. Which of the following is the best next step in management? Need Assignment Help? (A) Bladder ultrasound (B) CT urogram (C) Intravenous fluids (D) Intravenous furosemide (E) Urinalysis