Human blood group systems

For an overview of the main blood types and their clinical significance, see Blood type.

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 31 December 2022.[2]

  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.
  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.