There are 3 blood "factors". a million. "A" 2. "B" 3. "Rh" you have all 3 factors, consequently you're a "many times going on recipient". you may get carry of blood from anybody. Your variety is set by your mom and dad. You inherited your blood variety from them. One parent gave you the "A" element, the different parent gave you the "B" element, and one or the two mom and dad gave you the Rh element. A "many times going on donor", man or woman who can donate to anybody, has variety "O -" blood. this form of man or woman has not one of the three factors to offer to somebody else, so there is in basic terms no longer a mismatch. you could in basic terms donate blood to a distinctive "AB+" man or woman.