Human blood group systems

The term human blood group systems is defined by the International Society of Blood Transfusion (ISBT) as systems in the human species where cell-surface antigens—in particular, those on blood cells—are "controlled at a single gene locus or by two or more very closely linked homologous genes with little or no observable recombination between them",^[1] and include the common ABO and Rh (Rhesus) antigen systems, as well as many others; 44 human systems are identified as of December 2022^[update].^[2]

^ ISBT (2016). "International Society for Blood Transfusion (ISBT) Committee on Terminology for Red Cell Surface Antigens, Terminology Home Page". Archived from the original on 3 March 2016. Retrieved 20 February 2016.
^ "Red Cell Immunogenetics and Blood Group Terminology". International Society of Blood Transfusion. 2023. Archived from the original on 2 February 2022. Retrieved 25 April 2023.

[1] ISBT (2016). "International Society for Blood Transfusion (ISBT) Committee on Terminology for Red Cell Surface Antigens, Terminology Home Page". Archived from the original on 3 March 2016. Retrieved 20 February 2016.

[isbt-2019-2] "Red Cell Immunogenetics and Blood Group Terminology". International Society of Blood Transfusion. 2023. Archived from the original on 2 February 2022. Retrieved 25 April 2023.

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