Kidney function test is important to determine the state of renal function, the test mainly looks at the changes of creatinine, urea nitrogen, uric acid and β2 microglobulin and other indicators, of which creatinine and urea nitrogen changes are the main ones. 1. Creatinine: it is the metabolite generated by muscle in the process of energy production, which can be filtered into urine by normal kidney, so its value can indicate the filtration function of kidney, if the value increases, it generally represents the decline of renal function, and if it is greater than 707 μmol/L, it means that the organism has entered into the period of uremia. 2. Urea nitrogen: it is the product of protein, one of the indicators to check the filtration ability, normal is 3.2~7.1mmol/L, more than the range, it means that the filtration ability is poor and the kidney function is damaged. If the renal function test is abnormal, it is recommended to consult regular hospitals and standardize the treatment under the guidance of physicians.