Renal function tests are mainly blood tests, such as blood kidney function, blood biochemistry, which contains blood creatinine, urea nitrogen, cystatin, uric acid and other tests, which can well reflect the kidney function and electrolyte condition. Urine routine examination is mainly to look at the formation of urine, such as urine protein, urine red blood cells, urine white blood cells, etc., which focuses on finding the primary cause of renal insufficiency. Of course, there is another test in the clinic, which is to calculate the endogenous creatinine clearance rate, reflecting the renal function, excluding the interference of diet, exercise and so on, so it is more accurate.