Give reason
IT IS MUST TO KNOW THE BLOOD GROUP OF BOTH THE DONOR AND THE RECIPIENT BEFORE TRANSFUSING BLOOD.?
This is to prevent the risk of transfusing incompatible blood, which can be fatal.
To be precise, this is to prevent a hemolytic transfusion reaction. This is the reaction which occurs when the body of the recipient treats the transfused blood as a foreign agent, as it does not recognize the blood type. It thus starts to release to WBCs to destroy them. The throng of WBCs produced have nothing to fight against, so they randomly start destroying blood cells.
To be precise, this is to prevent a hemolytic transfusion reaction. This is the reaction which occurs when the body of the recipient treats the transfused blood as a foreign agent, as it does not recognize the blood type. It thus starts to release to WBCs to destroy them. The throng of WBCs produced have nothing to fight against, so they randomly start destroying blood cells.