Ordinary urinalysis tests cannot detect bladder cancer. If bladder cancer exists, it is possible that an elevated red blood cell count may be found in ordinary routine urinalysis. An elevated red blood cell count is not a specific sign of bladder cancer. A variety of diseases can show elevated red blood cell count, such as stones or infections, so ordinary urine tests cannot detect bladder cancer. The final diagnosis needs to be confirmed by obtaining specimens of bladder tumor tissue for biopsy and laboratory examination. The best way to confirm the diagnosis of bladder cancer is to directly observe whether there is a tumor inside the bladder through cystoscopy, and then to perform biopsy on the suspected lesions, and to determine whether the local lesion is benign or malignant through pathological section. Other imaging examinations, including ultrasound, CT or MRI, cannot reach a definite diagnosis, but only a suspected diagnosis.