Tell your doctor in advance of the procedure about all medications that you’re taking and about any allergies (especially Latex) you have to medication. He / she will tell you whether or not you can continue to take your medication as usual before the EUS examination.
For EUS of the upper gastrointestinal tract, you should have nothing to eat or drink, not even water, usually six hours before the examination. Your doctor will tell you when to start this fasting.
For EUS of the rectum or colon, your doctor will instruct you to either consume a large volume of a special cleansing solution or to follow a clear liquid diet combined with laxatives or enemas prior to the examination. The procedure might have to rescheduled if you don’t follow your doctor’s instructions carefully.
Your endoscopist will use a thin, flexible tube called an endoscope. Your doctor will pass the endoscope through your mouth or anus to the area to be examined. Your doctor then will turn on the ultrasound component to produce sound waves that create visual images of the digestive tract.