A 43-year-old man with alcoholism arrives at a drug rehabilitation facility. Physical examination shows an abdominal fluid wave and scleral icterus. Reflexes are brisk in the upper extremities. Serum calcium is 7.8 mg/dL. Intravenous calcium chloride is administered. Two hours later, serum calcium is 8.0 mg/dL. Which of the following is the most appropriate next step in management?
Check serum amylase and lipase
Check serum magnesium
CT scan of the abdomen
Magnetic resonance cholangiopancreatography
Ultrasonography
