The units of blood creatinine may vary from hospital to hospital because of the differences in the testing methods used by different hospitals. The units of blood creatinine are mainly umol/L and mg/dL. Generally, 1mg/dL = 88.4umol/L, which is relatively simple to calculate. The different units of creatinine do not affect the judgment of kidney function. If the blood creatinine is elevated, it often indicates renal insufficiency. For patients with acute renal insufficiency, the cause of acute renal insufficiency should be actively sought, and the creatinine value may return to normal after correcting the disease. For patients with chronic renal failure, we should actively delay the progression of renal failure and use kidney-protecting and nitrogen-lowering drugs, while paying attention to the regulation of blood pressure and blood sugar.