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.
Updated April 13, 2016. Hemolytic Disease of the Newborn (HDN) is a condition of red blood cell mismatch between a mother and her baby. This occurs when the mother's blood type is Rh negative and the baby is Rh positive. During the pregnancy the mother produces antibodies that attack and destroy red blood cells, resulting in anemia in the fetus.