There are four main blood groups defined by the ABO system: 1  blood group A has A antigens on the red blood cells with anti-B antibodies in the plasma. 2  blood group B has B antigens with anti-A antibodies in the plasma. 3  blood group O has no antigens, but both anti-A and anti-B antibodies in the plasma.
http://www.nhs.uk/Conditions/Blood-groups/Pages/Introduction.aspx
ABO system. a classification of human blood into four major groups, A, B, AB, and O, based on the presence on the surface of red blood cells of either of two antigens, A or B, or their absence, O: used in determining compatibility for transfusions.
http://www.thefreedictionary.com/ABO+system
The ABO Blood Group System. There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells: 1  Group A – has only the A antigen on red cells (and B antibody in the plasma). 2  Group B – has only the B antigen on red cells (and A antibody in the plasma).
http://www.redcrossblood.org/learn-about-blood/blood-types
The ABO Blood Group System. There are four major blood groups determined by the presence or absence of two antigens – A and B – on the surface of red blood cells: 1  Group A – has only the A antigen on red cells (and B antibody in the plasma).
http://www.redcrossblood.org/learn-about-blood/blood-types
The ABO blood group is identified by the presence or absence of two different antigens, A and B, on the surface of the red blood cell. The four blood types in this grouping, A, B, AB, and O, are determined by and named for these antigens. Type AB indicates the presence of both antigens; type O, the absence of both.
http://medical-dictionary.thefreedictionary.com/ABO+blood+group
The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies. People with type O have both anti-A and anti-B antibodies.
http://www.webmd.com/a-to-z-guides/blood-transfusion-blood-types
The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.
http://www.webmd.com/a-to-z-guides/blood-transfusion-blood-types
ABO system-a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O. ABO blood group system, ABO group. classification system-a system for classifying things.
http://www.thefreedictionary.com/ABO+system
1. ABO system-a classification system for the antigens of human blood; used in blood transfusion therapy; four groups are A and B and AB and O. ABO blood group system, ABO group. classification system-a system for classifying things.
http://www.thefreedictionary.com/ABO+system
Introduction. There are four main blood groups (types of blood): A, B, AB and O. Your blood group is determined by the genes you inherit from your parents.
http://www.nhs.uk/Conditions/Blood-groups/Pages/Introduction.aspx
what are the four groups in the ABO system
The four groups in the ABO system are A, B, Ab, and O. The four groups in the ABO system is A, B, AB, and O. A, B, AB, and O are the four groups in the ABO system.