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Background and Objectives: Cromer system antigens, a series of blood group antigens of very high frequency, are not considered to be clinically significant in transfusion. In renal transplantation only the ABO blood group antigens are considered essential. The Drori blood group antigen is present in serum and has been found to reside on the renal tubular basement membrane and Bowman's capsule. The effect of anti-Dra on the renal parenchyma has not been evaluated., Materials and Methods: A unique case of renal transplantation of an incompatible Dr(a+) kidney to a Dr(a-) patient with anti-Dra in her serum is presented., Results: Graft function was immediately good. The titer of anti-Dra remained unchanged following transplantation., Conclusion: The successful outcome of a case of a Drori (Dra)-incompatible kidney transplantation confirmed the lack of clinical significance of the anti-Dra relating to transplantation.

Women with the rare blood group p are known to have an increased rate of abortions. The case of a 36-year-old woman is presented who had had 7 spontaneous abortions in the first trimester and no live child. When treated by plasma exchange begun early in pregnancy and continued until the 29th week, she delivered a normal child. Time to begin, amount and length of time necessary to continue plasma exchange in these patients are considered. In addition, the question of which fraction of the anti-PP1Pk could be responsible for abortion is discussed. To our knowledge, this is the first case of a woman of p phenotype with no live children but with multiple abortions treated by this method, which should be seriously considered in similar cases.