
Blood typing is a method to tell what specific type of blood you have. What type you have depends on whether or not there are certain proteins, called antigens, on the red blood cells or if there are antibodies to these substances.
Blood is often grouped according to the ABO blood typing system. on This method breaks blood types down into four categories:
Your blood type (or blood group) also depends on what has been passed down to you from your parents.
Cross matching; Rh typing; ABO blood typing