anyway the objective is to administer ≥ 20mg in 24 hours during 2 or more days. It is not recommended to initiate transfusions of platelets concentrates when platelets are > 50 000/mm3, except in rapid decreasing or important hemolysis. The risk of hemorrhage during delivery and cesarean is high with platelets < 20,000/mm3 and platelet transfusion should be considered