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【单选题】
女,25岁。发热伴下肢和腹部皮肤瘀斑5天。查体:双下肢和腹部皮肤有多处瘀斑。双侧颈部、腋和股沟可触及淋巴结肿大,活动无压痛。最大者为2cm×2.5cm,胸骨压痛(+),腹软,肝肋下1.5cm,脾肋下2cm。实验室检查:Hb78g/L,WBC18×109/L,分类可见原始和幼稚细胞,PLT25×10/L,网织红细胞0.002。为明确诊断,首选的检查是A.
ANA谱
B.
淋巴结活检
C.
骨髓活检
D.
腹部B超
E.
骨髓细胞学检查
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