Sophisticated multichannel intraluminal impedance (MII) testing is used to detect all episodes of reflux and characterize them as acid or non-acid. This improves treatment for patients who have not obtained relief from acid-suppressive therapy. Motility testing examines the function of the esophagus to diagnose swallowing disorders and non-cardiac chest pain. MII enhances conventional motility studies to improve diagnose of disorders such as scleroderma and achalsia.