Estimated Glomerular Filtration Rate (eGFR) is a test for kidney damage. eGFR is calculated using your serum creatinine result, age and gender. Creatinine is not sensitive to early renal damage since it varies with age, gender and ethnic background. If you are African American, your eGFR is estimated differently. Since race is not reported in this screening, you will need to use the reported result that is associated with your race. To get a African American specific result, you can multiply this result by 1.21 to get your true eGFR. The same reference ranges will apply.