Twenty-four-hour pH monitoring of the distal esophagus. A quantitative measure of gastroesophageal reflux.
D004947:Esophagus / Q000503:physiopathology*; D005764:Gastroesophageal Reflux / Q000503:physiopathology*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008991:Monitoring, Physiologic / Q000379:methods; D011187:Posture