Check ABO blood group compatibility for donation and transfusion.
ABO compatibility is necessary but far from sufficient for transplantation, which also requires HLA tissue typing and crossmatching. Rhesus matters greatly for transfusion but much less for solid organ transplantation. Group O recipients can only receive group O organs despite being universal donors, which is why they typically wait longest on transplant lists.
Organ Donation Compatibility
ABO compatibility follows the antigen and antibody rules: O donates to all, AB receives from all
This reproduces a published formula for educational and reference use only. It is not a diagnostic tool, does not account for individual clinical context, and must not be used to make or change treatment decisions. Clinical assessment by a qualified healthcare professional is always required. This shows ABO rules only and does not determine transplant or transfusion suitability, which requires tissue typing, crossmatching and specialist assessment. Never rely on this for any clinical decision.
ABO compatibility follows the antigen and antibody rules: O donates to all, AB receives from all ABO compatibility is necessary but far from sufficient for transplantation, which also requires HLA tissue typing and crossmatching. Rhesus matters greatly for transfusion but much less for solid organ transplantation.
Group O recipients can only receive group O organs despite being universal donors, which is why they typically wait longest on transplant lists.
This calculator takes 4 inputs: Donor blood group, Donor rhesus, Recipient blood group, Recipient rhesus. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.