The best test to diagnose gastroesophageal reflux disease and quantify acid output is:: (A) Esohagogram, (B) Endoscopy, (C) Manometry, (D) 24 hr pH monitoring
Answer is D. "The gold standard for diagnosing and quantifying acid reflux is the 24-hr pH test." -Sabiston
Also, Know
Using 24-hour pH test an overall score is obtained. It is known as the DeMeester score.