Gm Allotyping to Determine the Origin of the Anti‐D Causing Hemolytic Anemia in a Kidney Transplant Recipient

Anti-D causing mild hemolytic anemia was found in the serum and on the red cells of a D-positive patient who had received a kidney transplant from his D-negative mother. Anti-D had been detected in the donor's serum before transplantation. Gm allotyping of the patient's serum, donor's serum, donor's anti-D, and the unexpected anti-D in the posttransplantation serum showed the antibody to be of maternal origin. The patient was Gm(fb), the donor Gm(agfb), the maternal anti-D Gm (afb), and the anti-D in the posttransplantation serum was Gm(a).