Isoimmunization in pregnancy to Gerbich antigen.

A case of hemolytic disease of the newborn due to Gerbich, a public antigen, is presented. The antibody which was IgG1 reacted in vitro with mononuclear phagocytes. Serial sonographic and amniotic fluid examinations were followed and a mildly jaundiced neonate was delivered. Further investigation may establish a relationship between severity of disease and IgG subclasses, a mononuclear phagocyte assay, and sonographic measurements. Sources of compatible blood for possible maternal, fetal, or neonatal transfusion include blood bank rare donor files, relatives, and autologous donation.