Praxis Medical Insights

Est. 2024 • Clinical Guidelines Distilled

Made possible by volunteer editors from the University of Calgary & University of Alberta

Last Updated: 8/30/2025

ABO Blood Type Antigens in Kidney Transplantation

Introduction to ABO Compatibility

  • The American Society of Transplantation recommends ABO blood group compatibility for kidney transplantation to prevent hyperacute rejection and graft failure 1, 2
  • ABO blood typing should be performed twice before donation to reduce the risk of unintended blood type incompatible transplantation, as suggested by the American Journal of Kidney Diseases 3
  • Donor blood group A subtype testing should be performed when donation is planned for recipients with anti-A antibodies, according to the American Journal of Kidney Diseases 3

ABO Compatibility and Histocompatibility Testing

  • ABO blood group compatibility is the primary consideration for donor eligibility, as stated by the American Society of Transplantation 1, 2
  • HLA matching improves long-term outcomes in kidney transplantation, as reported by the American Society of Transplantation 2, 4
  • Donor-specific crossmatching excludes donor organs from recipients with preexisting anti-donor immunity, as recommended by the American Society of Transplantation 1

Special Considerations for ABO-Incompatible Transplantation

  • ABO-incompatible transplantation carries increased risks and should still be considered experimental, according to the American Society of Transplantation 2, 4
  • Kidney paired donation programs can be considered for ABO-incompatible donors and recipients, as suggested by the American Journal of Kidney Diseases 3, 5
  • A2 to O transplantation may be successful in certain circumstances, as reported by the American Society of Transplantation 1, 4

Clinical Approach and Practical Considerations

  • Determining ABO blood type compatibility between donor and recipient is the first step in transplant evaluation, as recommended by the American Society of Transplantation 1, 2
  • Recipients should be informed about the risks and benefits of different transplant options based on blood type compatibility, as suggested by the American Journal of Kidney Diseases 3
  • ABO compatibility testing is the first step in donor evaluation before proceeding to more complex histocompatibility testing, as stated by the American Society of Transplantation 1, 4

Risks and Pitfalls

  • Relying solely on ABO compatibility without proper crossmatching can lead to transplant failure, as warned by the American Society of Transplantation 1, 6
  • ABO-incompatible transplantation should only be performed at centers with experience in effective incompatibility management strategies, as recommended by the American Journal of Kidney Diseases 3, 5