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The diagnostic yield has been improved with new test protocols that highlight abnormal bolus transit in the esophagus and outflow obstruction, as well as new high\u2010definition and high\u2010resolution technical advances in equipment. Functional luminal impedance planimetry and the addition of impedance to high\u2010resolution esophageal manometry have also allowed the assessment of new parameters to better understand esophageal structure and function. 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