患儿男，2岁，发热、咳嗽3天，局部肌内注射2-3天后发现注射部位肿胀。既往曾反复有下肢疲斑。査体：轻度贫血貌，脾不大。血常规：Hb85g/L,WBC12x109/L,血小板130xlO9/L。首先应考虑做下列哪项检查

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