[Preliminary results of the DGTI Workshop for evaluating the reactivity of monoclonal anti-D].

Within a working group of the German transfusion society, a workshop was conducted to evaluate the reactivity of monoclonal anti-D supernatants. During this evaluation 10,000 samples were tested, including 325 Du-samples, with 3-5 IgM type antibodies and 3-4 IgG type antibodies, which were selected to also find 'D-variants'. In general, the reactivity with D+ red blood cells was good, and specific in respect to D negative samples. Some samples have been found to have a different pattern of reactivity than the monoclonal antibodies used. Dependent on the method and on the antibody, in some studies up to 100% of Du samples could be detected by anti-D of the IgM type. Some data indicate that the reaction with Du samples is not dependent on titer. In addition, in separate studies the data show a correlation of reactivity in respect to the Rh-phenotype (CcDuee greater than ccDuEe).