![]() ![]() However, not everyone’s blood falls into these eight categories. According to the American Red Cross, fewer than 1% of Americans have AB negative (AB-) blood, and fewer than 4% have AB positive (AB+) blood. Of the eight blood types, Group AB- is the least common blood type in the U.S.-and worldwide. O negative blood (O-): Red blood cells do not have the A and B antigens, but do not have the Rh factor.O positive blood (O+): Red blood cells do not have the A and B antigens and have the Rh factor.AB negative blood (AB-): Red blood cells have the A and B antigens, but do not have the Rh factor.AB positive blood (AB+): Red blood cells have the A and B antigens and Rh factor.B negative blood (B-): Red blood cells have the B antigen, but do not have the Rh factor.B positive blood (B+): Red blood cells have the B antigen and Rh factor.A negative blood (A-): Red blood cells have the A antigen, but do not have the Rh factor.A positive blood (A+): Red blood cells have the A antigen and Rh factor.Using these two categorization systems, there are eight blood types : It is more common to have Rh+ blood than Rh- blood. ![]() Each of the four blood types can be Rh-, meaning there is no Rh factor cell surface protein on your red blood cells, or Rh+, meaning Rh factor is present. Ascher explains.īlood types are further classified according to the Rh system, which identifies the presence or absence of the Rhesus (Rh) factor (a protein antigen) on the surface of red blood cells. Type O has no antigens, but both antibodies, and Type AB has both antigens, and no antibodies, Dr. For example, blood type A has A antigens and anti-B antibodies the opposite is true for type B blood. The most common ABO blood group is O, followed by group B, group A, and group AB (the least common).Īccording to Eric Ascher, DO, a family medicine physician at Lenox Hill Hospital in New York, blood types also indicate what antibodies (proteins that attack foreign red blood cells) your blood has. The four main blood types are A, B, AB, and O. This system categorizes blood types based on the presence or absence of specific markers (sugars) on red blood cells called Antigen A or B. There are four major blood types grouped by the ABO blood group system. ![]()
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