The standard creatinine values range from 30-110 μmol/L. This indicator of creatinine is relatively common in clinical practice. It is an indicator of kidney function, and in most cases it is used together with urea to evaluate kidney function. A decrease in creatinine is not of great clinical significance, while an increase in creatinine is of greater clinical significance. Elevated creatinine generally refers to creatinine greater than 110μmol/L, which represents abnormal kidney function and indicates a decrease in the detoxification ability of the kidneys. The reference value may be different due to the different testing methods and reagents used by each hospital, with some having a normal upper limit of 90 μmol/L and some 130 μmol/L. Therefore, when determining whether there is elevated creatinine and abnormal kidney function, it is important to combine the reference values tested by local hospitals. If elevated creatinine and abnormal kidney function are found, it is necessary to actively search for the cause and stop it.