PF4 and Thrombocytopenia: Confirmation of VITT is also possible in cases of minor thrombosis (located e.g., in pulmonary arteries or veins, limb veins, cerebral arteries, or other arteries/veins) in combination with minor thrombocytopenia (a platelet count below 150 × 109/L but above 50 × 109/L), but with the detection of antibodies against PF4.