Not all kidney diseases can be detected by blood test. There are more kidney diseases, some kidney diseases can be detected by blood check, while some kidney diseases can not be detected by blood check. For example, if a patient is suffering from kidney failure, blood tests can detect it. The main check is the kidney function, observe whether creatinine and urea are elevated, if it is elevated, it can be diagnosed as renal failure. If the patient has nephritis, such as chronic nephritis, acute nephritis, blood tests can not be detected. At this time, routine urine examination should be performed to observe whether the urine protein and red blood cells are positive. If the patient is suffering from kidney tumor, kidney stone or kidney cyst, blood test will not be able to find out either, and ultrasound or CT examination of the urinary tract is needed. In brief, renal diseases include renal function lesions, nephritis lesions and renal occupancy lesions, which need to be diagnosed by improving renal function, urinary routine and urological imaging.