Normal values of kidney function tests are as follows: blood creatinine 53~106μmol/L for men and 44~97μmol/L for women; blood urea 3.2~7.1μmol/L; and blood uric acid 150~416μmol/L for men and 89~357μmol/L for women; however, the reference values may be different in each hospital due to different testing instruments. Kidney function test is important for early kidney injury diagnosis, treatment and prognosis judgment. 1. Normal value of blood creatinine: 53~106μmol/L for men and 44~97μmol/L for women, which is an important indicator reflecting glomerular filtration function and can be used as a criterion for staging renal failure. 2. Normal value of blood urea: 3.2~7.1μmol/L, blood urea is not as accurate as blood creatinine to reflect renal function. It is often affected by various factors such as catabolism, diet and gastrointestinal bleeding. 3. Normal value of blood uric acid: 150～416μmol/L for men; 89～357μmol/L for women. When kidney damage occurs, uric acid can not be discharged from the body in a timely manner, which will cause uric acid to rise. In addition, each hospital may have different reference values due to different testing instruments; if abnormal kidney function is found, it is recommended to go to regular hospitals for further examination and treatment in time so as not to delay the treatment time.