Seroconversion of red blood cell antibody in abo-incompatible living donor liver transplantation-a case report-

Background: Liver transplantation usually requires blood transfusion, and a red blood cell (RBC) antibody screen is essential for the prevention of a hemolytic reaction. Since proper ABO-compatible grafts are lacking, ABO-incompatible living donor liver transplantation (ABO-i LDLT) with desensitization is a feasible therapy. Desensitization includes intravenous rituximab injection and plasmapheresis before surgery. Case: A 60-year-old female was diagnosed with hepatitis B virus-related hepatocellular carcinoma and planned for ABO-i LDLT. She tested positive in a RBC antibody screen over two years; however, she tested negative for the test after desensitization. Clinicians noted the seroconversion during induction, and thus, a delay in the preparation of ade-quate packed RBC was unavoidable. Conclusions: Even when the latest RBC antibody screen is negative after immunosuppres-sion, clinicians should consider the possibility of a prior positive result to promote safer medical treatment and management.