eGFR stands for estimated glomerular filtration rate, which is a measure of how well your kidneys are working. It is calculated based on a blood test that measures the amount of creatinine in your blood, along with your age, sex, weight, and race. The eGFR test is considered a mostly reliable test for doctors to know how well your kidneys are working. A normal eGFR is 60 or more, and if your eGFR is less than 60 for three months or more, your kidneys may not be working well. The eGFR test is used to determine your stage of kidney disease, and people with a lower eGFR are at increased risk of having chronic kidney disease (CKD) progress to kidney failure. The eGFR test report will give a number that will tell doctors the amount of creatinine in your blood. If your eGFR number is low, your healthcare team will want to find the cause of your kidney disease and continue to check your kidney function to help plan your treatment.