ABO/RhD Blood Grouping Cards (New borns).For the determination of the ABO/D antigens and the direct antiglobulin test (DAT) for newborns, using human antibodies. The direct antiglobulin test (DAT) on newborn blood samples has become a standard procedure, since it is of importance to know if the newborn's red cells have been sensitised with maternal antibodies in utero. Cord or heel prick samples can be used.