CV. International Society on Thrombosis and Haemostasis (ISTH) Interim Guidance for the Diagnosis and Treatment on Vaccine-Induced Immune Thrombotic Thrombocytopenia (Updated 20 April, 2021)
Step 1: Who is at risk for VITT?1) COVID-19 vaccination 4-28 days prior to onset of symptoms?o VITT has only been identified following AstraZeneca or Johnson & Johnson vaccine. It has not been identified after other vaccines.2) Signs/symptoms suggestive of thromboembolism?Examples include (but not limited to) NEW ONSET:○ Severe, persistent headache +/- vision change, seizure-like