The ABO grouping system is also classified into four types based on the presence or absence of antigens on the red blood cells(RBC) surface and plasma antibodies.
The ABO group system plays an important role during blood donation or blood transfusion as mismatching of the blood group can lead to clumping of red blood cells causing various disorders.
For example, a person of blood group A can receive blood either from group A or O as there are no antibodies for A & O in blood group A.
Blood types O positive can donate to:
O positive people can donate blood to all Rh+ blood types i.e. A positive, B positive, O positive, and AB positive.
O positive blood group is the most commonly found blood group in about 35% of the world population.