Characteristics of Immunoglobulines Igg lgm iga led lgE Serum con.(mg/d)120012020030.01 Percentage 70-805-1010-15<1<0.01 Half life( days) 21 72.82.3 Distribution (9o) 45 80 457550 Quantity(mg/kg)1150492301.50.04 Synthesis(mg/kg/D) 35 7 25 0.4 0.02 Transport through placenta Wang Xiaochuan Children's HospitalWang Xiaochuan Children’s Hospital Characteristics of Immunoglobulines IgG IgM IgA IgD IgE Serum Con. (mg/dl) 1200 120 200 3 0.01 Percentage 70-80 5-10 10-15 <1 <0.01 Half life(days) 21 5 7 2.8 2.3 Distribution (%) 45 80 45 75 50 Quantity (mg/kg) 1150 49 230 1.5 0.04 Synthesis(mg/kg/D) 35 7 25 0.4 0.02 Transport through placenta + - - - -