Currently, there are two clinical units of blood creatinine: 1) μmol/l and 2) mg/dL. The conversion between these two units is 1 mg/dL equals 88.4 μmol/L. Most hospitals use the unit μmol/L, while a few use the unit mg/dL. For example, the test is 88.4 μmol/l, which is equivalent to a blood creatinine level of only 1 mg/dL. The normal range of blood creatinine value has its own standard in each hospital, because the test method is different and the standard may be different. If the normal value of blood creatinine is in μmol/L, the upper limit is generally 133 μmol/L. There are also some hospitals where the test result may be 104 μmol/L as the upper limit. If the creatinine exceeds or is close to the upper limit of the normal value, it may indicate a kidney problem, so it is recommended to go to the hospital for related examination as soon as possible.