The 24-hour intra-esophageal pH Monitoring Test in the diagnosis of gastroesophageal reflux.
D004566:Electrodes; D005764:Gastroesophageal Reflux / Q000175:diagnosis*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008991:Monitoring, Physiologic / Q000379:methods*; D013997:Time Factors