what are the two most common blood types
When discussing blood types, the two groupings most commonly used are the ABO (A, B, AB, O) and Rh (+, -) systems. The least common blood type in humans is Bombay (EXTREMELY râ¦are), which is a type O with missing H antigen. Otherwise, of the normal ABO and Rh typings, the least common group is AB-.
Blood groups further classified as Rhâpositive or Rhânegative are called blood types. Blood is Rhâpositive if the. blood antigen labeled âDâ is present and it is Rhânegative if the âDâ antigen is absent. O+ is the most common blood type. Not all racial and ethnic groups have the same mix of these blood types. Hispanic people, for example, have a relatively high number of Oâs, while Asian people have a relatively high. number of Bâs.