O negative blood for everyone? No, transfusion and obstetrical management of a pregnant woman with an anti-public H1I1 antibody

A woman pregnant with her first child, blood group B+, showed pan-agglutination on antibody identification panels during her pregnancy follow-up. The absence of agglutination between the patient's plasma and a panel of B-phenotype red blood cells led to the conclusion of the presence of an anti-H1I1. This antibody is not thought to be responsible for fetal anemia or neonatal hemolytic disease, thus follow-up of fetal anemia is not necessary. However, in the event of transfusion, prior compatibility with blood of the same ABO group is necessary. In emergencies, group O depot blood should not be used whenever possible.