PF4 and Thrombocytopenia: Should these antibodies be nonspecific against “autoantigen PF4”, the antibody will be rested as an “epiphenomenon” [13,127,128,129], but if some of the antibodies are very specific and serious against the neo-antigen such as “PF4-heparin” complex, then the patient could develop “true” heparin-induced thrombocytopenia with “white clot syndrome” [130,131].