Blood creatinine 209μmol/L indicates that blood creatinine is elevated, which can be divided into physiological and pathological. Physiological includes eating a lot of meat, after strenuous exercise, creatinine will often return to normal after removing related factors, no special treatment is needed; pathological includes acute and chronic renal failure, etc., according to the different causes of the disease, choose basic treatment, nutritional therapy, drug therapy, etc. 1. Physiological: after strenuous exercise or eating a lot of meat, blood creatinine may rise transiently, after reducing exercise and adjusting diet, creatinine will return to normal in general. 2. Pathologic: including acute and chronic renal failure. Acute renal failure is divided into pre-renal, renal and post-renal. Pre-renal such as effective circulating blood volume is insufficient, need to replenish fluids in time, or even supplement blood volume; post-renal such as stones, should be active stone removal or surgical treatment. Chronic renal failure treatment includes basic treatment, nutritional therapy and drug therapy. Basic treatment includes the treatment of primary disease, hypertension patients actively lowering blood pressure, diabetic patients actively lowering sugar; nutritional treatment includes controlling protein intake, limiting phosphorus, etc.; medication includes the treatment of ACEI/ARB drugs, such as valsartan and enalapril. Patients found to have elevated blood creatinine should go to the hospital regularly to find out the cause and standardize the treatment under the guidance of professional physicians.