Impedance/pH Probe Test

What is an Impedance/pH Probe Test for Children?

An impedance/pH probe test – also called esophageal impedance-pH monitoring – is a test that measures both acid and non-acid reflux in your child’s esophagus (the tube that carries food from the mouth to the stomach). It uses a very thin, flexible tube (catheter) with tiny sensors that detect movement of liquid, food and air, as well as changes in acid level. This test helps doctors understand how often reflux happens, how long it lasts and whether it is connected to your child’s symptoms.

Doctors may recommend an impedance/pH probe test if your child has symptoms such as heartburn, chest pain, chronic cough, hoarseness, asthma that is hard to control, recurrent pneumonia, feeding problems, or poor weight gain. It is also used when medicines for reflux are not working as expected, or before or after certain surgeries for reflux or for esophageal achalasia. The test can help diagnose gastroesophageal reflux disease (GERD), non-acid reflux and reflux that may be reaching the airway.

What takes place during the test?

During the test, a small amount of numbing medicine is placed in one nostril. The thin catheter is then gently passed through the nose into the esophagus and taped in place on the cheek. The end of the tube connects to a small recorder worn on a belt or strap. Your child will eat, drink and do normal activities as instructed. You will be asked to keep a diary of symptoms, meals and sleep. The test usually lasts 18 to 24 hours. Afterward, the tube is removed, and the doctor compares the recorded reflux episodes with your child’s symptoms.

Why Choose Nationwide Children’s Hospital?

At Nationwide Children’s, impedance/pH probe testing is performed in our Neurogastroenterology and Motility Disorders Center, one of the highest-volume pediatric motility centers in the country. Our team includes pediatric gastroenterologists, nurses and motility technologists who specialize in testing and treating children with complex reflux and swallowing problems. We use child-sized equipment, pediatric anesthesia support when needed and child-life specialists to reduce fear and discomfort. Families travel from across the United States and around the world for our expertise. Results are interpreted by experts in pediatric motility, and we use the findings to build a clear, individualized treatment plan so your child can feel better and get back to everyday life.