31/05/2023
The classification of blood into different types is based on the presence or absence of antibodies and hereditary antigenic compounds on the surface of red blood cells (RBCs). The most common blood grouping system is the ABO group. There are four major categories within the ABO group. A,B,O and AB. Within these groups there are a further eight blood types (A+,A-,B+,B-,AB+,AB-,O+,O-).