Hematology was consulted prior to initiating treatment, and their recommendations included a comprehensive coagulation workup to evaluate for disseminated intravascular coagulation (DIC), thrombotic thrombocytopenic purpura (TTP), and infection-related coagulopathies, as well as PF4 antibody testing to assess for heparin-induced thrombocytopenia (HIT). This evidence concerns the gene PF4 and thrombotic thrombocytopenic purpura.