RHA blood type, this is an incorrect way of expressing it, as the correct way of expressing it would be RH-negative blood type A, or RH-positive blood type A. The reason for this is that there are various blood types in humans, in addition to the more familiar ABO blood type system. Because the human blood type system has a variety of systems, in addition to the more familiar ABO blood type system, the human body also has the RH blood type system. the ABO blood type system includes A blood type, B blood type, AB blood type and O blood type, all people are no more than one of these four blood types. the RH blood type according to the red blood cell membrane and whether there is also the D antigen is divided into two categories, containing the D antigen is the RH-positive, and does not contain the D antigen is the RH-negative. RH negative. A person is either RH positive or RH negative. A person can only be one of four in the ABO blood group system, as well as only one of positive and negative in the RH blood group. So RHA blood type is an incorrect expression, it should be either RH positive A blood type, or RH negative A blood type.