There are eight different bloodtypes: O+, O-, A+, A-, B+, B-, AB+, AB-. AB can receive blood from anyone, but can only donate to another AB person. A can receive blood from groups A or O, but can only donate to an A or AB person. B can receive from B or O, but can only donate to a B or AB person. O is the universal donor and can donate to anyone, but can only receive from another O individual.