Which blood group is known as the universal blood type?
All donors belong to one of four blood groups: A, B, AB or O. You are also classified as either Rh positive or Rh negative. There are therefore eight different main blood groups.
Not all blood groups are compatible with each other and the success of modern transfusion medicine depends on classifying and matching donors and patients correctly.
Group O negative blood is known as the universal blood type, as it can be given to patients of any blood group.