<prompt> Hemophilia A has following except -VIII factorPTTPTNormal BT  <response>: Hemophila AHemophilia A is due to deficiency of factor VIII.Hemophilia A is inherited as an X-linked recessive trait.Factor VIII is an intrinsic pathway component required for activation of factor X.Clinical manifestations are due to defect in coagulation system : -Large post-traumatic ecchymoses or hematoma.Prolonged bleeding after a laceration or any form of surgical procedure.Bleeding into weight-bearing joints.Petechiae are characteristically absent in contrast to platelet dysfunction where bleeding occurs from small vessels of the skin and mucous membrane, e.g., petechiae.Laboratory findings PTTNormal PTNormal BTNormal platelet countsRememberHemophilia B Christmas disease is due to deficiency of factor IX.Hemophilia B has clinical features and laboratory findings similar to hemophilia A. 