Renal function is actually the ability of the kidneys to excrete metabolites in the body, which is the result of blood tests, and the indicators reflecting renal function mainly include creatinine, urea nitrogen and uric acid. If kidney failure occurs, creatinine and urea nitrogen may rise accordingly, while uric acid may also rise due to impaired excretion. However, kidney function is not the only indicator to judge whether the kidney is healthy or not, and even if the kidney function is normal, kidney disease cannot be excluded. Because common patients with glomerulonephritis also have normal kidney function in early stage, this time also need to do routine urine test, urine microalbumin, 24hUP quantification and other related tests. Relatively speaking, if there is urinary occult blood and urine protein in the urine routine, it often suggests the possibility of nephritis.