A Gastroesophageal Reflux test using mucosal attached telemetry pH electrode placement and recording.  A small capsule containing a radiotelemetry pH sensor is inserted endoscopically in the esophagus and temporarily attached to the esophagus wall.  The capsule monitors esophageal pH levels over a 48-hour period.  This information is then transmitted to an external pager-sized receiver worn by the patient that records pH levels.  After the 48-hour testing period, data is downloaded from receiver to a computer that contains software for analyzing pH levels.  A written interpretation of the computer analysis is generated by the facility or person reading it (BRAVO).  The capsule does not need to be removed as it spontaneously detaches within 7-10 business days and passes through the digestive tract.