<prompt> Characteristic lab findings of hemophilia A are a PTb aPTTc Xlinked recessived Presence of 30 of factor level express the diseasee Increased bleeding timeacacbc  <response>: Hemophilia A Hemophilia A is due to deficiency offactor 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 hematomaProlonged 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 findingsPIT Normal PT Normal BT Normal platelet counts RememberHemophilia B Christmas disease is due to deficiency of factor IXHemophilia B has clinical features and laboratory findings similar to haemophilia A. 