Estimated Glomerular Filtration Rate or eGFR is a number based on your blood test for creatinine, a waste product in your blood. It indicates how well your kidneys are working. The stages of kidney disease are based on the eGFR number.
Stage 1 CKD: eGFR 90 or greater, which means your kidneys are healthy and working well
Stage 2 CKD: eGFR Between 60 and 89 indicates you have mild kidney damage
Stage 3 CKD: eGFR Between 30 and 59 means that there is some damage to your kidneys and they are not working as well as they should.
Stage 4 CKD: eGFR Between 15 and 29 which means your kidneys are moderately or severely damaged. This stage should be taken very seriously.
Stage 5 CKD: eGFR Less than 15 means the kidneys are getting very close to failure or have completely failed.