Even having red blood cells that you can't see called microscopic hematuria.

即使有你看不见的红细胞也叫微观血尿。

Diagnosis involves a history and physical exam, as well as imaging studies like X-rays, CT scans or ultrasound, and finally urinalysis because it might show microscopic or gross hematuria or blood in the urine.

诊断基于病史、体格检查，X光、CT平扫、超声等影像学检查，最后还有尿常规，因为它可以显示镜下血尿或者肉眼血尿，即尿液中有血。