Yet, because immune thrombocytopenia with associated thrombosis may also be found in other clinical conditions, as we previously reported, we suggest in the case of negativity of ELISA test to detect anti-PF4-Hep ab to consider other clinical conditions associated with immune thrombocytopenia and thrombosis (Table 2 and Figure 1). Here, PF4 is linked to autoimmune thrombocytopenic purpura.