Preparation: Before the procedure, you will need to fast for a certain period of time, usually overnight. Your doctor may also ask you to stop taking certain medications.

Anesthesia: You will be given a sedative and local anesthesia to make you more comfortable during the procedure.

Endoscope insertion: The doctor will insert an endoscope, which is a thin, flexible tube with a light and camera attached to it, through your mouth and into your stomach.

Dye injection: Once the endoscope is in place, the doctor will inject a contrast dye into the bile and pancreatic ducts through a small tube that is passed through the endoscope. This dye will help highlight the ducts on X-ray.

X-ray imaging: X-rays are taken while the dye is being injected. This allows the doctor to see the ducts and any abnormalities, such as stones or tumors.

Treatment: If the doctor finds a blockage or abnormality during the procedure, they may be able to treat it at the same time. For example, they may use a tiny tool passed through the endoscope to remove a gallstone or place a stent to keep a duct open.

Recovery: After the procedure, you will be monitored until the sedative wears off. You may experience some mild discomfort, such as bloating or a sore throat, but these should go away within a few hours. You will also need someone to drive you home.