All of the following are used in the treatment of TTP, except:

d. Platelet transfusion is not used in the treatment of Thrombotic Thrombocytopenic Purpura (TTP). In fact, platelet transfusion can worsen TTP by exacerbating the thrombotic process. The other options—corticosteroids, plasma exchange therapy, cryosupernatant transfusion, and vincristine—are used in the management of TTP.