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There is currently no reference standard test for the detection of the extra-esophageal manifestations of gastroesophageal reflux disease (GERD). The current suite of diagnostic tests principally assesses reflux events in the esophagus. A new scintigraphic technique has been developed and validated against reference standards. It allows direct visualization of refluxate in the laryngopharynx and lungs.
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Wall et al. (2024) studied this question.
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