Endoscopic Ultrasound (EUS)

Your visit

Before your exam, you and your physician will discuss why you are receiving EUS, the possible complications and any available alternative procedures that are available. The EUS procedure can be done on the upper gastrointestinal tract (upper GI) and lower gastrointestinal tract (lower GI).

Upper GI EUS

During an upper GI tract EUS, you'll normally lie on your left side. The ultrasound endoscope passes through your mouth, esophagus and stomach into the duodenum. The instrument does not interfere with your breathing.

Before the exam begins, your throat will be sprayed with a local anesthetic. You will also receive an intravenous sedative to relax you during the procedure. You may receive air and water through the endoscope. During and after the procedure, you may temporarily feel bloated and full.

Most patients find the exam only slightly uncomfortable and many fall asleep. The EUS exam usually takes 15 to 45 minutes.

Preparation for Upper GI EUS

For the safest and most accurate upper GI EUS examination (esophagus, stomach, duodenum, gallbladder or pancreas), your stomach must be completely empty. Do not eat or drink anything, including water, for six hours before the exam. Your physician will give you instructions about when your fasting should begin.

Lower GI EUS

For a lower GI EUS, you will lie on your left side with your back toward your physician. The exam is usually performed safely and comfortably without medication. You'll receive a sedative only if the exam will be longer than normal or if the endoscope must be inserted further into the colon.

You may receive air and water through the endoscope. During and after the procedure, you may temporarily feel bloated and full. The exam usually takes 10 to 30 minutes.

Preparation for Lower GI EUS

For an EUS exam of the rectum or colon, your lower bowel must be clean. Before the exam, your physician will give you detailed instructions about any dietary restrictions and a cleansing routine that usually includes laxatives. Please follow your physician's instructions carefully or you may need to reschedule your exam for another day.

Your Current Medications

Tell your physician what prescription and nonprescription medications you currently take. Also inform your physician of any medication allergies you have. Continue to take your medications until the day of your EUS unless your physician gives you other instructions.

Your physician will advise you about which medications you can take on the day of your exam. These include essential high blood pressure and heart medications, which you should be able to take as usual. These also include aspirin and nonsteroidal anti-inflammatories (e.g., Advil®, Aleve®, Motrin®), as well as insulin or anticoagulant medications such as Coumadin® or heparin.

Be sure to ask any questions about any of your medications before the day of your exam.


You normally won't receive antibiotics before or after EUS. If necessary, you can get them intravenously during the exam. You may also receive them for certain EUS procedures such as fluid collection or draining a cyst. Follow your physician's orders for taking any antibiotics before and/or after your exam. Again, be sure to inform your physician of any medication allergies you may have.

Risks and Complications of EUS

Your throat may be mildly sore for a day or two after the procedure. Over-the-counter throat lozenges may help. You may also have some mild bruising or a tender lump where your intravenous line was inserted. Applying hot, moist towels should relieve any discomfort.

Whenever endoscopes are used, there is a rare chance that a tear or hole could occur in the lining of the bowel. This could require an operation to repair the tear or hole, or a transfusion to replace any blood that has been lost internally.

What to Expect Following EUS

If you were sedated, we'll monitor your recovery until most of the effects have worn off. After an upper GI EUS, your throat may be a little sore. You may also feel bloated and full because of the air and water you received during the exam. However, you should be able to resume your normal diet immediately unless your physician gives you other instructions.

Driving After EUS

If you are sedated for your EUS exam, you won't be able to drive afterward. Please make arrangements with a family member or friend to drive you home.

KU MedWest

EUS is available only at The University of Kansas Health System's KU MedWest location

7405 Renner Road
Shawnee, Kansas 66217

Make an Appointment

To make an appointment or get more information, please call:
  • 913-588-1227
  • Toll-free 844-323-1227

Referring Physicians

To refer a patient, please call:

  • 913-588-5862
  • Toll-free 877-588-5862