First Case of Hemolytic Disease of the Newborn due to Anti-Ul^a Antibodies

The first case of hemolytic disease of the newborn (HDN) due to anti-Ul^a antibodies is described. The infant had severe anemia with a positive direct antiglobulin test with anti-IgG that required blood transfusion. But jaundice was not severe enough for exchange transfusion or phototherapy.