It would actually be very harmful, and considering the already weakened state of someone who is in need of a transfusion, they could die. This is because his or her immune system would consider the...
Nothing. O blood is the universal donor, which means any blood type can get O blood in a transfusion. Although this is true blood type O can only receive blood type O. This is because Blood type O...
If you receive a blood transfusion, you are under no obligation to "return" (or "donate") any blood to back the blood bank. This is true both before and after receiving a blood transfusion - i.e you...