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GFR-glomerular filtration rate is the best test to measure your level of kidney function and determine your stage of kidney disease. Your doctor can calculate it from the results of your blood creatinine test, your age, body size and gender.Your GFR tells your doctor your stage of kidney disease and helps the doctor plan your treatment. If your GFR number is low, your kidneys are not working as well as they should.The earlier kidney disease is detected, the better the chance of slowing or stopping its progression.our GFR tells your doctor your stage of kidney disease and helps the doctor plan your treatment. If your GFR number is low, your kidneys are not working as well as they should.
Your health care provider will use a blood test to check your kidney function. 1  The results of the test mean the following: 2  a GFR of 60 or more is in the normal range. Ask your health care provider when your GFR should be checked again. 3  a GFR of less than 60 may mean you have kidney disease.