Temporal changes of platelet counts, ADAMTS13-related markers, and BAFF in acute iTTP cases. The levels of (A) ADAMTS13 activity, (B) ADAMTS13 antigen, (C) anti-ADAMTS13 inhibitor, (D) anti-ADAMTS13 IgG, (E) platelet counts, and (F) plasma BAFF were compared between the day of onset and days 7, 14, 21, and 28 after initiating TPE. The error bars depict the first and third quartiles. ∗P < .05 and ∗∗P < .01.