The common unit of creatinine in our clinic is umol/L and mg/dL, 1mg/dL=88.4umol/L, 88.4umol/L=0.0884mmol/L. Therefore, if mg/dL is converted to mmol/L, it is equivalent to 1mg/dL=0.0884mmol/L. Although the unit of creatinine is different, it can reflect the condition of kidney function. Although the unit of creatinine is different, it can reflect the condition of renal function, and the unit of creatinine used by each hospital is different. When creatinine rises, it often indicates that kidney function is impaired. Even if creatinine is normalized, it does not mean that our kidneys are not impaired. Even if creatinine is normal, it doesn’t mean that our kidneys are not damaged, because the kidneys have a strong compensatory ability, only when the glomerular filtration rate is less than 50ml/min, it will show the increase of creatinine.