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How does impedance testing diagnose GERD?

Lawrence S. Friedman, MD
Gastroenterology
Impedance testing, approved in the United States in 2002, is a sophisticated testing method for gastroesophageal reflux disease (GERD) requiring specialized training. Impedance testing monitors the transport of ions through the esophagus and can detect reflux. For this test, the doctor passes a flexible catheter through the nose and down into the esophagus. Sensors at the end of the catheter relay information to a recording device. You wear the impedance device overnight while going about your normal activity. It is particularly useful for patients who have non-acid reflux.

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