Platelet parameters in healthy controls and in patients with ITP at 0, 7, and 28 days of eltrombopag treatment. (A) Platelet count, (B) mean platelet volume (MPV), (C) immature platelet fraction (IPF) %, and (D) absolute immature platelet fraction (AIPF). Data are mean ± SEM (*P < .05; **P < .02; ***P < .001).