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Five examples of a “new” blood group antibody, anti‐Rd (Radin), are reported. The corresponding antigen, Rd, is infrequent and does not correspond to any other known “low‐incidence” antigen. Family studies indicate that Rd is an autosomal dominant character which does not belong to the ABO, MNSs, Rh, Lutheran, Kell or Kidd blood group systems. Furthermore, the gene determining Rd is not closely linked to either the haptoglobin or red cell acid phosphatase loci. Anti‐Rd caused mild to moderate hemolytic disease of the newborn in all five families and has appeared with the first pregnancy.
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Rausen et al. (1967) studied this question.
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