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According to studies, three out of 10 patients are did not have asthma when they were first objectively examined. But one way to know if a patient indeed has asthma is through bronchial challenge testing. These tests are designed to rule out a diagnosis of current asthma. And Provocholine is the sole methacholine chloride approved by the FDA for the diagnosis of bronchial hyper-responsiveness. Learn more about Provocholine and how it should be used on…See More