Yes: Some physicians used to test for asthma with what is called a methacholine or histamine challenge test. These chemicals when inhaled in an asthmatic would cause bronchoconstriction of the airways at lower levels of the drugs than non-asthmatics. This is not done much (maybe not at all) anymore. Now asthma is generally diagnosed through clinical means - history and symptoms and reactions.
Answered 6/29/2014
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A doctor has provided 1 answer
4 doctors weighed in across 2 answers
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