A 72-year-old woman from Bangalore presents with acute onset jaundice, right upper quadrant pain, and fever (38.5°C). Serum bilirubin is 9.1 mg/dL, ALP 310 IU/L, ALT 210 IU/L, and prothrombin time is 18 seconds (INR 1.6). Ultrasound shows a dilated CBD (14 mm) with an echogenic shadow and dilated intrahepatic ducts. Blood cultures are pending. What is the most appropriate immediate next step?

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