过敏性哮喘的主要发病机制是以IgE(或IgG_4)介导的Ⅰ型变态反应。判断其特异性病因和机体过敏程度对防治哮喘具有指导意义。所谓特异性病因诊断,是查明致喘性过敏原的具体类型与性质。病史可能提供重要的线索,不借助一些实验室检查,就缺乏客观的依据。(图1) The main pathogenesis of allergic asthma is IgE (or IgG_4) -mediated type I allergy. Judgment of its specific etiology and the degree of allergy to the prevention and treatment of asthma is instructive. The so-called specific cause of diagnosis, is to identify the specific type and nature of allergens caused by asthma. Medical history may provide important clues, without some laboratory tests, there is no objective basis. (figure 1)