Creatinine up to 120 μmol/L and less than 133 μmol/L belongs to stage I nephropathy. Creatinine is a product of muscle metabolism and is excreted from the body from the urine after glomerular filtration. If renal insufficiency occurs, creatinine cannot be excreted from the body, which will cause the creatinine value in the body to rise. The normal value of blood creatinine is 53-106μmol/L for men and 44-97μmol/L for women. creatinine values above this level indicate renal insufficiency. Creatinine below less than 133μmol/L belongs to stage I kidney disease. Creatinine in the range of 133-221μmol/L belongs to stage II nephropathy. Creatinine above 442μmol/L belongs to renal failure. Therefore, when creatinine is found to be elevated, patients should immediately visit the nephrology or urology department to actively search for the cause and take appropriate treatment. Chinese medicine is effective in protecting kidney function.