Endoscopic Ultrasonography (EUS) is a procedure that joins traditional endoscopic procedures with ultrasound technology. This allows the examination of tissue and structures not only within the digestive tract, lower colon and rectal area, but also surrounding it.

EUS Lower Procedure Preparation

  • Your physician or physician's office will give you instructions as to which bowel preparation you will need to clean out your colon.
  • If you do not receive prep instructions, please contact the physician who will be performing the procedure.
  • Contact the physician and inform him or her of any special needs, medical conditions, latex allergy or current medications you are taking.
  • The GI Lab staff will attempt to contact you the evening before your procedure to answer any questions you may have.

Pre-EUS Lower Procedure Expectations

  • You may be expected to arrive 30 minutes prior to your scheduled exam time.
  • The procedure usually takes about 30-60 minutes.
  • During the exam, there is often a feeling of cramping, bloating or pressure in the abdominal area. Sometimes water is instilled into the colon.
  • Patients usually lie on their left side or on their back during the exam.
  • During the procedure the physician may take biopsies (small tissue samples) or remove polyps (growths on the lining of the colon).

Post-EUS Lower Procedure Expectations

  • Since the sigmoid colon is expanded with air during the procedure, you are encouraged to pass flatus (gas) after the procedure.
  • Once you have met the discharge criteria, the physician will discuss with you the preliminary findings.
  • Patients are provided discharge instructions to take home.

Note: This procedure is not routinely performed with intravaneous sedation.


The nature of our practice is to provide our patients the utmost in care and services. We ask ahead of time to please excuse any delay in care. Our commitment is to provide you with the same careful attention and care as soon as possible. You can expect excellent care and service in the GI Labs of NorthShore University HealthSystem.

This procedure is available at all of our GI lab locations
To schedule an appointment call the Patient Access Center at 1.888.364.6400. 

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