anemia AE abo incompatibility AE 10000206 QY, JX, HY ABO血型不相容 This is an AE which maternal IgG antibodies with specificity for the ABO blood group system pass through the placenta to the fetal circulation where they can cause hemolysis of fetal red blood cells which can lead to fetal anemia and HDN. http://en.volupedia.org/wiki/Hemolytic_disease_of_the_newborn_(ABO)