Final answer:
The patient was sent to the hospital for ERCP to perform a cholangiogram, incise the sphincter, place a stent for drainage, and diagnose the cause of upper abdominal pain.
Step-by-step explanation:
The reason for sending the patient to the hospital for ERCP was to perform a cholangiogram, incise the sphincter, place a stent for drainage, and diagnose the cause of upper abdominal pain. ERCP, or endoscopic retrograde cholangiopancreatography, is a procedure in which a tube is inserted through the throat and into the small intestine to visualize the ducts of the gallbladder, liver, and pancreas using dye and X-ray imaging.