Creatinine in clinical practice can be divided into blood creatinine and urine creatinine, and there are two common units of blood creatinine, umol/L and mg/dL. For conversion is relatively simple, in clinical practice 1mg/dL = 88.4umol/L, and it only requires a simple multiplication and division method to convert between the two. Whether umol/L or mg/dL is used, it can reflect whether the blood creatinine is in the normal range. If the blood creatinine appears to be elevated, it suggests that renal insufficiency may exist. If renal insufficiency is present, you should actively go to the hospital for consultation to clarify the cause of renal insufficiency and to cooperate with the doctor’s direct treatment. If there is a decrease in blood creatinine, it indicates malnutrition or low metabolic rate in elderly patients, and pregnant women may lead to a physiological decrease in blood creatinine.