The objective of this video is to help guide respiratory professionals in the administration of the methacholine challenge test to diagnose bronchial hyperreactivity in subjects who do not have clinically apparent asthma. This video is intended to enhance your knowledge and proficiency of the methacholine challenge test according to the American Thoracic Society and European Respiratory Society recommendations. It is a dose-response test; therefore the delivery of the methacholine and measurement of the response must be accurate in order to produce valid test results.



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