IGHE and Increased total eosinophil count: In the laboratory inspection, patients with eosinophilia showed higher peripheral WBC, ESR, serum IgG, IgG1, IgG3, IgG4, IgE, and IgG4/IgG ratio, while lower serum IgA, IgG2 and C4 level (P < 0.05, Table 1).