通常公认尿中红细胞>3个/每高倍视野或>8000个/毫升则为血尿。血尿提示尿路可能有严重性疾患,包括恶性肿瘤。纵使血尿轻微、间歇或无症状,亦应予以足够重视,详细进行病因检查,以免延误诊断和治疗。在1组无症状的246例血尿中,发现尿路有严重病变者占22%,其中恶性肿瘤占10%;另1组200例血尿中,尿路严重病变占20%,其中恶性肿 Urinary red blood cells are generally recognized> 3 / high power field or> 8000 / ml is hematuria. Hematuria may indicate a serious condition of the urinary tract, including malignancies. Even if hematuria is mild, intermittent or asymptomatic, should also be given enough attention to detailed etiological examination, so as not to delay diagnosis and treatment. In a group of 246 cases of hematuria asymptomatic, urinary tract was found to have 22% of serious lesions, of which 10% of malignant tumors; another group of 200 cases of hematuria, urinary tract serious lesions accounted for 20% of which malignant