Ambulatory reflux monitoring for diagnosis of gastro‐esophageal reflux disease: Update of the Porto consensus and recommendations from an international consensus group

The consensus group determined that grade C or D esophagitis, peptic stricture, histology proven Barrett's mucosa >1 cm, and esophageal acid exposure greater >6% are sufficient to define pathological GERD. Further testing should be considered when none of these criteria are fulfilled.