The term human blood group systems is defined by International Society of Blood Transfusion 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 ...
BLOOD GROUPS. At present, 33 blood group systems representing over 300 antigens are listed by the International Society of Blood Transfusion.[2,3] Most of them have been cloned and sequenced.The genes of these blood group systems are autosomal, except XG and XK which are X-borne, and MIC2 which is present on both X and Y chromosomes.
The Rh blood-group system. Rh is the most complex of the human blood-group systems. It has 52 well-defined antigens, the most immunogenic of which is D (RH1). Between 82% and 88% of Caucasians, about 95% of black Africans, and almost 100% of people from the Far East are D-positive.
ABO blood group system, the classification of human blood based on the inherited properties of red blood cells (erythrocytes) as determined by the presence or absence of the antigens A and B, which are carried on the surface of the red cells. Persons may thus have type A, type B, type O, or type AB blood. The A, B, and O blood groups were first identified by Austrian immunologist Karl ...
Blood types depend on the content of the blood cells and are inherited from parents. There are eight common blood types, and receiving a donation of each affects the immune system in a different ...
Since their discovery in 1900, a variety of different styles of terminology has been used to denote human blood groups. In 1980 the ISBT established therefore a Working Party (later to become a Committee) to devise and maintain a genetically based numerical terminology for red cell surface antigens.
PDF | International Society of Blood Transfusion has recently recognized 33 blood group systems. Apart from ABO and Rhesus system, many other types of antigens have been noticed on the red cell ...
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Thirty-five major human blood group systems (including the ABO and Rh- systems) were recognised by the International Society of Blood Transfusion (ISBT) in October 2012. In addition to the ABO antigens and Rh (Rhesus) antigens, many other antigens are expressed on the red blood cell surface membrane.
The most well-known and medically important blood types are in the ABO group. They were discovered in 1900 and 1901 at the University of Vienna by Karl Landsteiner in the process of trying to learn why blood transfusions sometimes cause death and at other times save a patient.
Blood Types (Groups) A blood type (also called a blood group) is defined as the classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). A series of related blood types constitutes a blood group system, such as the Rh or ABO system.