It is not possible to convert to glomerular filtration rate based on creatinine alone; it needs to be combined with other information such as gender, age, ethnicity, and then estimated based on estimation formulas such as MDRD, CKD-EPI, and others. Some formulas may also require knowledge of test data such as urea and cystatin C. Glomerular filtration rate is an important indicator reflecting the filtration function of the kidneys, and the direct testing method is cumbersome and expensive, which is very seldom applied in the clinic. Various estimation formulas are usually applied for estimation. At this time, you need to know the creatinine and other laboratory tests, and then combine with other information, such as race, gender, age, etc. to estimate, the more commonly used are CKD-EPI formula, MDRD formula. In addition to that, renal ECT can also be applied to measure, the advantage of this method is that the glomerular filtration rate of unilateral kidney can be known. For patients with abnormal creatinine, it is recommended to consult regular hospitals and standardize the treatment under the guidance of physicians.