Blood Group ‘O’ is special in that, in rhesus negative form (that’s me), it can be given to both rhesus positive and rhesus negative people. In an emergency, when lives may depend on transfusions and there may be no time to test a patient’s blood group, ‘O’ rhesus negative blood is a life saver.
Yes but my sister has been told she may need a kidney transplant and unfortuneately it doesnt work the other way round. O can only receive O.