Are blood types that make up less that 10% of the population considered rare blood types?
No. A “rare” blood type is where only one person in 1,000 lacks the same antigen. If only one in 10,000 people lack an antigen, the type is considered “very rare.” There are more than 600 antigens known today, and more are discovered each year. The most familiar antigens are those of the ABO Blood Group already mentioned. Other antigens are less familiar, because they are found in very few people’s blood. Sometimes the reverse is true: there are some antigens that most of us carry in our red cells but which a few people’s red cells lack-their blood is said to be “negative” for those antigens.
