An esophageal manometry is a procedure used to measure pressures and swallowing function inside the esophagus. It is also possible to determine if the valves are opening and closing properly and at the right time.
A pH probe is a test used to test for the amount and seriousness of acid reflux, or stomach acids that back up into the esophagus. A small flexible tube will be passed through one of your nostrils and placed into position in the esophagus.