The four major blood groups are based on whether or not you have two specific antigens — A and B. Doctors call this the ABO Blood Group System. The third kind of antigen is called the Rh factor.

Experts at HealthBeat say that members of one blood group in particular have a lessened chance of a coronary-related ...

People with one of the type A blood groups are more likely to have a stroke before the age of 60 compared with people with ...

Researchers from the UK and Israel have identified a new blood group system in humans, marking a major breakthrough in hematology. The discovery, published in September, stems from a puzzling case ...