Antro-Duodenal Manometry

What is antro-duodenal manometry?

The term antro-duodenal comes from the two words "antrum" and "duodenum." The antrum is the area at the bottom of the stomach, which prepares food to go into the small intestine. The duodenum is the first part of the small intestine, which receives the food. (Figure 1)

Manometry is the measurement of pressure or contractions in the small intestine. The purpose of antro-duodenal manometry is to determine how well the antrum and the duodenum work together. 

Antro-Duodenal Manometry

  • If your child is old enough, explain to your child how the test is done at a time that you feel is best. The nurse will help you with this.
  • It may be helpful to bring a favorite toy, video or game to make your child more comfortable during the test.
  • Some medications may interfere with this test. You may be asked to stop certain medications up to 72 hours before the test.
  • Feeding instructions: Your child should have no solid foods for eight hours before the test. Your child may have clear liquids up until four hours before the test, and then nothing by mouth for the four hours before the test. Clear liquids include sugar water, Kool-Aid, Jell-O, popsicles, apple juice, ginger ale and water.
  • Reassure your child that you will be with him / her during the entire test.
  • When a child has antro-duodenal manometry done at Cincinnati Children's Hospital Medical Center, it will start in the Endoscopy Suite or the Radiology Department where your child will lie on a table in an X-ray room.
  • A pediatric anesthesiologist will administer anesthesia, a gas that helps your child sleep during the test.
  • Once your child is asleep, an intravenous (IV) line will be started to keep him/her hydrated.
  • The doctor and nurse will wear gowns, gloves and plastic glasses.
  • A small tube with several holes in it will be passed through your child's nose and down through the stomach and into the small intestine. (Figure 2) Time will be allowed for your child to adjust to this tube.
  • Your child will go to the Recovery Room or the wake-up room to wake up.  
  • Your child will then be taken to the A4 South unit for testing.
  • The tube will be connected to the monitoring device, which is on a cart next to the patient's bed. The monitoring device is connected to a computer. (Figure 3). Contractions of the small intestine are recorded on the computer monitor. 
  • During the test your child will have to remain in bed.
  • Your child may sit up or lie down and may read, or watch TV or videos during the test.
  • As part of the test, your child may be given a meal and / or medication through his/her IV (intravenous) line.
  • The test will be run either later the same day or early the next morning. 



  • When the child wakes up from anesthesia, he may feel slightly uncomfortable, but over time he will get used to the tube in the nose.  
  • Because the test involves putting water into the small intestine, your child may need to go to the bathroom more often than usual. Your child will have to use a bedpan or urinal.
  • This test does not cause pain.
  • When the tube is taken out, your child may feel like sneezing or complain of a slight sore throat. These symptoms should go away within a few hours.
  • Your child may return to a normal diet, play and usual activities unless he/she has other tests scheduled.
  • Your child's doctor will discuss the results of the test with you.

Last Updated 06/2015