Someone's blood type is considered rare if they lack "antigens that 99% of the people are positive for." If you lack an antigen 99.9% of people have, your blood type is " extremely rare." ...

Blood type is a personal medical detail that doesn't come up much in casual conversation or even at doctor's visits, so I never really thought much about mine until it was required when filling ...

Blood type basics Blood type is categorized into one of these eight groups: A-positive, A-negative, B-positive, B-negative, O-positive, O-negative, AB-positive and AB-negative.