Hemolytic Disease of the Newborn  RhD  Most commonly identified antigenic stimulus  Mother is Rh negative, fetus Rh positive  The incidence has dropped with the use of anti-D antibodies to decrease maternal sensitization  ABO  Mother is type O, fetus is type A, B  Kell, Duffy, Kidd  Maternal sensitization may be due to prior maternal blood transfusions mismatched in the minor blood types
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