In an emergency type blood can be administered to a patient who is ABO group type.?

In an emergency, O group blood can be administered to a patient of any blood group. Blood group O individuals have neither antigen A nor B on the surface of their red blood cells and hence it is commonly known as the universal donor blood group. When given to a person of any blood group, the O group red blood cells will not be recognized as foreign or hostile by the patient’s immune system.