Before the first blood transfusion, the following blood tests are performed:
Every three days, and as needed, pre-transfusion tests are taken.
Erythrocyte concentration—Rh(D) negative products can usually be given to everyone while Rh(D) positive can only be given to Rh(D) positive receivers.
Thrombocyte concentration—Rh(D) negative girls and women in fertile ages who obtain Rh(D) positive thrombocyte products should be given a prophylaxis for Rh immunization. Boys/men and women who are over the fertile age may obtain thrombocytes regardless of Rh(D) type.