3个月小儿，单纯母乳喂养，因咳嗽1天，惊厥1次就诊。査体：T380C，嗜睡状，面色苍白，前囟膨隆，张力高，四肢肌张力阵发性增高，院外査Hb7Og/L,采血部位仍有渗血。入院后应首先做以下哪项检査帮助患儿明确诊断

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