血尿一定是泌尿系统肿瘤引起的吗?

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血尿是指尿液中带血的特定情况。血尿可以是肉眼可见的(肉眼血尿)或仅在显微镜下可见的(镜下血尿)。文献报道的无症状血尿发生率为1.7%~31.1%;一般临床工作中,血尿的发生率通常为4%~5%。甜菜类食物、一些带颜色的药物、部分月经出血或胃肠系统出血也可能混入尿液,使尿色变红。发生肌红蛋白尿(横纹肌溶解症)或血红蛋白尿(溶血)时,尿液也可以呈红色或黑色。
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