The Gold standard investigation for Gastro-Oesophageal reflux disease is:: (A) Endoscopy, (B) 24 hour esophageal pH recording, (C) Oesophageal manometry, (D) Measurement of length of lower oesophageal sphincter
Answer is B. 24 hour Esophageal pH recording provides a quantitative & sensitive documentation of acidic reflux episodes.