A 68-year-old with non-valvular AF is on anticoagulation. On routine blood tests the platelet count is 75 x10^9/L. He has petechiae. What is the most likely haematological disorder to considerAPernicious anaemiaBPolycythaemia veraCImmune thrombocytopenic purpuraDVon Willebrand diseaseEHaemophilia ACheck my answer