eGFR is the English abbreviation for estimated glomerular filtration rate. Glomerular filtration rate is an index to assess the waste excretion function of the kidney, and its direct measurement is very difficult, and in most cases, the glomerular filtration rate is estimated by various methods. The following two methods are commonly used. First, the glomerular filtration rate is directly assessed by renal ECT, which has relatively high accuracy. Second, the glomerular filtration rate is estimated by various formulas, which often require the results of age, race, gender, weight, creatinine, urea nitrogen, albumin, cystatin C, etc. The commonly used formulas are CKD-EPI formula and MDRD formula, etc.