患儿男，2岁，因发热、咳嗽，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。血象:Hb 85g/L,WBC 12X109/L,PLT 130X109/L。首先应考虑做的检査是

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