案例：患者，男性，56岁。既往病史不详。本次因“皮肤黄染伴乏力10天，神志改变1天”入院。查体：神志朦胧，语无伦次，全身皮肤及巩膜黄染，未见肝掌、蜘蛛痣，肝脾肋下未触及。为明确诊断，对该患者还需做的辅助检査是

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