案例：患者，男性，52岁。有肝硬化病史。因“发热、咳嗽、咳脓痰伴呕吐、腹泻2天，神志模糊2小时”来院。查体：相对缓脉，左下肺散在湿啰音。WBC11×109/L，血钠125mmol/L。胸片：左下肺炎。对早期诊断和鉴别诊断，意义最小的检查是

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