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.