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.
Erythroblastosis fetalis is also known as hemolytic disease of the newborn (HDN). It occurs when the blood of the baby combines with the motherâs blood during pregnancy, and the immune system of the mother produces a certain reaction, wherein the white blood cells attack the red blood cells of the baby as they recognize it as foreign invaders.