What Are the Cons of Blood Type O Positive? Blood type O is the most common blood type in the world, with about 38% of people having this blood type. Blood type O is characterized by the absence of A or B antigens on the surface of red blood cells. O positive is a subtype of blood group O, and is determined by the presence of the Rh factor on the surface of the red blood cells.
Rh Factor and Blood Type O Positive
The Rh factor is a protein found on the surface of red blood cells. If you

