Question

2. Why is it necessary to know the blood groups
before giving transfusion?​

Answer 1

Answer:

Your blood type is inherited from your parents and is determined by two factors: the ABO grouping system and the Rh factor. Starting with the ABO system, there are four blood groups: A, B, AB and O. The type of blood you have is based on the presence or absence of antigens and antibodies in your blood. Antigens are proteins that stick to the surface of your red blood cells, while antibodies are produced in the plasma or liquid portion of the blood. The type of antigen you have tells us what your blood type is. For example, if you have A antigens on your blood cells, your blood type is A. If someone has both A and B antigens, they are type AB. And if you do not have any antigens, your blood type is O. For each antigen on the blood cell, the opposite antibody is produced in the plasma. For example, type B blood has anti-type A antibodies.

In addition to the ABO typing system, your blood type is also determined by the presence or absence of another antigen known as the Rh factor. For example, if you are Rh-negative and have A-type blood, you are A-negative; if you have B-type blood and are also Rh-positive, you are B-positive. While there are more than 20 blood-type systems, ABO and Rh are the most important ones.