Nitric oxide report card, referring to nitric oxide breath test, is mainly for the examination index of respiratory inflammatory response, which needs to be combined with the etiology and clinical performance to make a comprehensive determination of lung function. An increase in the test index indicates an inflammatory response in the body, mainly in the respiratory tract. Clinically, it is mainly used for bronchial asthma, cough variant asthma and other chronic inflammatory responses in the respiratory tract, as one of the diagnostic indicators for these diseases. In the clinical analysis of its quantitative, for normal adults below 25PPB, children is below 20PPB, if there is a significant increase, it indicates the more serious inflammation caused by airway hyperresponsiveness state.