Analysis of the HYDROGEN ION CONCENTRATION in the lumen of the ESOPHAGUS. It is used to record the pattern, frequency, and duration of GASTROESOPHAGEAL REFLUX.

Synonyms: Ambulatory Esophageal pH Monitoring, Esophageal pH Monitorings, Esophageal pH Monitoring, pH Monitorings, Esophageal, Ambulatory 24 hour Esophageal pH Monitoring, Esophageal pH Recordings, pH Monitoring, Esophageal, Recordings, Esophageal pH, pH Recording, Esophageal, Monitorings, Esophageal pH, Ambulatory 24-hour Esophageal pH Monitoring, Esophageal pH Recording, Recording, Esophageal pH, Monitoring, Esophageal pH, pH Recordings, Esophageal