男性，20岁。高热、寒战伴腰痛1天，次日 晨起尿色呈浓茶样，化验结果：Hb 70g/L,RBC 2 .0 X 1012/L,WBC 6. 0X 109/L,PLT 80X109/L。急诊首选检查是

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