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患儿女，12岁。腹痛，皮肤出现紫癜1天，紫癜以四肢为主，呈对称性分布。实验室检查如下：Hb125g／L，WBC12×109／L，N61％，E9％，L30％，PLT210×109／L，出血时间4分钟，凝血时间（试管法）6分钟，血块收缩良好。大便隐血(++)。尿蛋白(+)。骨髓增生活跃，三系细胞大致正常。该患者最可能的诊断是 A.血管性血友病 B.过敏性紫癜 C.特发性血小板减少性紫癜 D.急性白血病 E.再生障碍性贫血 该病最具特征性的诊断指标是A、血小板功能缺陷 B、病变部位血管周围显示IgA或C3沉着 C、血小板抗体阳性 D、骨髓增生活跃，巨核细胞数减少 E、血浆血管性血友病因子检测阳性
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