If both A and B antigens are present, the blood type is called AB. If B antigen is present instead of A on the surface of your RBCs, you are said to have blood type B. If your RBCs have A antigen on their surface, you are said to have blood group A. There are two major blood group antigens called “A” and “B.” Your blood group is determined by the genes you inherit from your parents. 
Your blood group is determined based on the presence or absence of certain substances, called blood group antigens, on the surface of your red blood cells (RBCs). Research suggests that people with blood group O have a lower risk of heart diseases and memory problems (including dementia) than the rest of the population. O-positive and CMV-negative blood type is the safest blood type that can be transfused to immunocompromised newborns.Īlthough the O-positive people can donate blood to people with any positive blood type, they can only receive blood from O positive and O negative (O−) people.
O-positive blood type is preferred because it has minimal risk of reactions and because it is more readily available than O negative blood group.Ĭytomegalovirus ( CMV)-negative people with O positive blood group are also called “heroes for babies.” CMV negative means those individuals who have not been exposed to cytomegalovirus. This may be done in patients with severe injuries such as road traffic accidents and other emergencies. During emergencies in patients with unknown blood groups requiring blood transfusion, O-positive blood is the preferred type to be transfused. It is, thus, also the blood type whose shortage may occur often owing to its huge need. More than 80 percent of the people have a positive blood type, making O-positive blood in high demand. People with blood group O positive can donate blood to not only other O positive people but also all other positive blood types (including A+, B+, and AB+). It is also the most needed blood type because it is most commonly required during blood transfusions. About 43 percent of Americans have an O blood type of which O positive accounts for about 38 percent of the population. People with blood group O positive can donate blood to other O positive people, as well as all other positive blood types (A+, B+, and AB+).īlood group O positive (O+) is the most common blood type among Americans.
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