Multiple choice Autoimmune thrombocytopenic purpura (ITP) is characterised by an increase in platelet count a decrease in platelet count bone marrow abnormalities blister formation on the skin Reveal answer Fill a bubble to check yourself B Correct answer Explanation Autoimmune thrombocytopenic purpura is characterised by a decrease in platelet count. ITP is an autoimmune disease with antibodies detectable against several platelet surface antigens.