Clinical importance of ADAMTS13 activity during remission in patients with acquired thrombotic thrombocytopenic purpura

To the editor: Acute episodes of acquired autoimmune thrombotic thrombocytopenic purpura (TTP) are associated with severe ADAMTS13 deficiency, commonly defined as <10%.[1][1] Patients may also have severe ADAMTS13 deficiency during remission after recovery, without thrombocytopenia,