The typical time window, which is already known from HIT [73] and VITT [74], of at least 4 to 5 days between the triggering agent and onset of thrombocytopenia or thrombosis is also present in VITT-like disorders and reflects the time that is needed to produce relevant titers of anti-PF4 antibodies. Here, PF4 is linked to Thrombocytopenia.