Objectives The Rh blood group system is one of the most important and immunogenic blood group systems after the ABO blood group system and, like other blood group antigens, it follows ethnic and racial trends. However, when it comes to D variants—partial D and weak D—most of the cohorts studied in the literature have been of European descent. This study aimed to discover the variant D trends in Detroit, Michigan, with an emphasis on Black communities. Methods From 2016 to 2018, there were 102 patients (women of childbearing potential: < 50 years) at Henry Ford Hospital that had serologic D discrepant testing. These patients were sent out for molecular RHD determination. Results In total, 12.7% of patients were characterized as RhD positive and 87.3% of patients were characterized as RhD variants (nominated as RhD negative at our institution). Conclusions Our predominantly Black cohort sheds light on the diversity of the RhD antigen. The majority of Blacks were classified as RhD variants (RhD negative nomination at our institution). Therefore, molecular testing for this patient population with serologic RhD discrepancies is paramount to properly manage their obstetric care.

Background and Objectives D‐negative patients undergoing orthotopic liver transplantation (OLT) might require a large number of red blood cell (RBC) units, which can impact the inventory of D‐negative blood. The blood bank might need to supply these patients with D‐positive RBCs because of inventory constraints. This study evaluates the prevalence of anti‐D formation in D‐negative OLT patients who received D‐positive RBCs perioperatively, as this will assist in successful patient blood management. Materials and Methods This was a retrospective study performed at a single academic medical centre. Electronic medical records for all 1052 consecutive patients who underwent OLT from January 2007 through December 2017 were reviewed. D‐negative patients who were transfused perioperatively with D‐positive RBCs and had antibody screening at least 30 days after transfusion were included. Results Of a total of 155 D‐negative patients, 23 (14.8%) received D‐positive RBCs perioperatively. Seventeen patients were included in the study. The median age was 54 years (range 36–67 years); 13 (76.5%) were male. The median number of D‐positive RBC units transfused perioperatively was 7 (range 1–66 units). There was no evidence of D alloimmunization in any patient after a median serologic follow‐up of 49.5 months (range 31 days to 127.7 months). The average number of antibody screening post OLT was 7.29. Conclusion Our study showed that transfusion of D‐positive RBCs in D‐negative OLT recipients is a safe and acceptable practice in the setting of immunosuppression. This practice allows the conservation of D‐negative RBC inventory.