A 46-year-old woman presents to emergency because of a 1-hour history of abdominal pain. Vitals are: temp 101 F; HR 80, RR 16, BP 130/80. She has presented to the physician before for episodic upper abdominal pain. An ultrasound is performed. Laboratory studies show:
Total bilirubin 2.0 g/dL
ALP 400 IU/L
Amylase 1200 IU/L
Which of the following is the next best step in diagnosis?
A) CT of the abdomen
B) Endoscopic retrograde cholangiopancreatography
C) Endoscopic ultrasound
D) IV 0.9% saline
E) Magnetic resonance cholangiopancreatography
