The abbreviation eGFR stands for estimated glomerular filtration rate, notes the American Kidney Fund. An eGFR calculation provides valuable information about a person's kidney function.
Estimated glomerular filtration rate is based on a person's creatinine level, explains the American Kidney Fund. Creatinine is a waste product that is filtered out of the bloodstream by the kidneys. Once a person has a creatinine blood test, the result is used to calculate an eGFR value. An eGFR of above 60 is considered normal. A low eGFR level usually indicates kidney damage, but the test is not accurate in all people. For example, the test does not always provide an accurate estimate of kidney function in people who are very muscular or very overweight.