How the blood is separated into different groups?

Human blood is separated into four major groups. They are A, B, AB and O. Each letter refers to the kind of antigens or protein on your red blood cells.

1.      A type blood group – Contains A type antigen on your red cells and B antibodies in your blood plasma.

2.      B type blood group- Contains B type antigens on your red cells and A antibodies in your blood plasma.

3.      AB type blood group – Contains both A and B antigens on your red cells and no A and B antibodies at all in your blood plasma.

4.      O type blood group- You have neither A or B antigens on your red cells, but you have both no A and B antibodies at all in your blood plasma.

Each blood group is also combined with its Rhesus factor which is also called Rh factor. Combinations like Rh+ or Rh -. Checking or knowing the blood type is necessary during blood transfusion. During blood loss it is important to get required blood immediately from the donor side. Cross matching the blood type of patient with the donor’s blood using the blood type, to avoid unwanted reactions.