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患者女,19岁,学生,广东三水人,因“上腹痛、腹泻1周”来诊。近1周右上腹隐痛、腹泻、食欲不振、疲乏,排粪3~6次/d,稀粪,无脓血,无发热、畏寒。发病前曾食生鱼3次。查体:皮肤无黄染,无皮疹;心、肺未见异常:肝、脾肋下未触及,肝区无叩痛,肠鸣音亢进。实验室检查:血RBC5.2×1012/L,WBC9.1×109/L,N0.61,L0.21,E0.17,M0.02,PLT215.2×109/L;ALT80U/L。肝B型超声:左肝内小胆管扩张。
对诊断有较大意义的实验室检查是()
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