Estimated Glomerular Filtration Rate (eGFR) is the estimated rate at which your kidneys are able to produce “cleansed blood” by filtering out waste products, like creatinine. This number is calculated using your serum creatinine result along with your age, weight, and biological sex. A care provider can use this number to understand how well your kidneys are functioning and if you may benefit from medical or lifestyle interventions to improve kidney function. If you have diabetes, it is especially important to understand how your condition is affecting your kidneys.