juxtaposition (plural juxtapositions) 1  The nearness of objects with little or no delimiter. 2  The extra emphasis given to a comparison when the contrasted objects are close together.
Hemolytic disease of the newborn (HDN), also known as alloimmune HDN or erythroblastosis fetalis, is a potentially fatal alloimmune condition where fetal red blood cells are destroyed by transplacentally acquired maternal antibodies. RhD is the most common offending paternal antigen.
ABO incompatibility is a relatively common type of hemolytic disease of newborns, and may occur during blood transfusion reactions of older people. For purposes of this article, we will discuss ABO Incompatibility of the newborn.