Blood accounting is based on molecules that are on the apparent of red claret cells. There are abundant accounting systems of which two are a lot of important for transfusing blood: ABO and Rh. In the ABO system, the types are A, B, AB and O. In the Rh system, the types are D antigen absolute and D antigen negative. The "D antigen" is usually dropped; however, it is the "D" in anti D immunoglobulin.
The a lot of accepted claret blazon is O positive; others are O negative, A positive, A negative, B positive, B negative, AB absolute or AB negative. If claret gets intermixed, as happens with affectionate and fetal claret at birth, the Rh factors charge to match. If it does not match, there may be a austere problem: the claret of the Rh abrogating getting (for example, Mom) will accomplish antibodies to the claret of the Rh absolute getting (for example, baby). Those antibodies will abort the red claret beef in the claret of the baby. If this happens, injections of anti D immunoglobulin should anticipate the the assembly of antibodies. Anti D immunoglobulin is acquired from donated claret from humans who accept developed antibodies adjoin Rh-D absolute blood.
from:Acridine Raw Material