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). This evidence concerns the gene PF4 and deep vein thrombosis.