In this entry, I would like to comment on how the fact that asthma is such a common disease can in some cases lead to individuals being told they have "asthma," yet on detailed review with specialized tests, are found not to have asthma. I know that this can sound a little confusing: "My doctor told ...
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There is a new test that will help with the diagnosis of asthma called exhaled nitric oxide (eNO). It directly measures the amount of eosinophillic inflammation in the lungs and can have predictive value for who will respond positively to inhaled or oral steroids. It is a simple 11 second breath manuever and can be done in the physicians office. It does not replace spirometry, but provides important information on the degree of inflammation in the lung.