IL4 and Increased total eosinophil count: Classically, this form of asthma is associated with an increase in serum immunoglobulin E (IgE) antibodies and eosinophilia, as well as the presence of interleukin 4 (IL-4)–, IL-5-, and IL-13-producing cells in bronchoalveolar lavage (BAL) [18].