女，14岁，月经量增多9个月，2周来牙龈出血，下肢散在出血点及癣斑。血常规Hb85g/L,WBC5.6x109/L,PLT32x109/L。初步诊断为原发性血小板减少性紫癜，下列哪项检査对诊断最有帮助

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