In: Anatomy and Physiology
Case 1.
A. His ABO blood group is group O. It's the most common group in the world. The unmatched RBCs are transfused in to the patient. So he is given with O negative blood. As the test is not done to identify the Rh antigen if negative is given there is no antigen in it. So if the patient not having The antigen is supplied with blood having Rh antigen it will create serious issue. In order to avoid that O Rh-ve is given.
B. Yes it's essential. We can't give mismatched blood to the patient. Inorder to infuse blood to a patient the crossmatch checking is done with the donor and patient. If the patient has blood group A and the donor has blood group B. The patent has antibody B with him. So if the B group is given. Agglutination reaction occurs and take the life of patient.
C. If a mismatched blood group is given as we dusy in the previous point agglutination reaction will occur.
Case 2.
A. The technician followed the correct procedure. To each of the wells with blood drops he added Antibody A to the first and Antibody B to the second. As agglutination occur the the blood group is AB. If blood has Antigen A it agglutinate in the first well and if the blood has Antigen B it agglutinate in the second well. So it's AB.
B. Antigens are most suitable molecules to create an immune response. But here it's a blood group antigen. It's present with the blood and not harmful to the human. The antibodies are the protein molecules that reacts to the antigen and makes an immune response. In case of blood too if antigen and antibody acts immune response occurs and leads to agglutination.