The eGFR is an estimated glomerular filtration rate that is used to reflect the function of the kidneys. It is used to assess the ability of the patient’s kidneys to remove metabolic waste from the body by measuring how many milliliters of blood can be cleared of creatinine per minute (ml/min) by the glomerulus. Generally, this test requires a blood test for creatinine, which is calculated to estimate what the glomerular filtration rate of the patient is. Under normal circumstances, the glomerular filtration rate of a healthy person is about 110-130 ml/min. If the eGFR decreases, it means that the kidney function is impaired; if this indicator is elevated, it can be seen in a normal state, but also in diabetic nephropathy, early glomerulonephritis and pregnant women.