Esophageal Ambulatory pH Testing

People who do not respond to normal medical treatment for GI problems may be advised to have a 24-hour ambulatory pH test, in which a special monitor is placed in the esophagus that records acid reflux over a period of time. The test will show how frequently acid refluxes into the esophagus, the activities that cause the reflux, how long the acid remains in the esophagus and the symptoms that occur during the reflux.

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