Airway responsiveness is another test that can be used to diagnose asthma. If the diagnosis is not clear from the more simple test such as the spirometry test. The airway responsiveness test measures how an individual airway react when the airways come into contact with a trigger. The individual would be asked to breathe in a medication that deliberately would irritate or constrict an individual's airway slightly. If an individual has asthma a small decrease in the individual FEV1 measured using spirometry and possibly triggering mild asthma symptoms. However, if an individual does not have asthma their airways would not respond to the stimulus. When the airway responsiveness test is being done, it involves, inhaling progressively increasing
