In all individuals, an eGFR level less than 60 milliliters per minute per 1.73 meters squared for three months or more may indicate chronic kidney disease, according to MedlinePlus. An eGFR of less than 15 indicates kidney failure and requires prompt medical care.
A normal eGFR ranges from 90 to 120 milliliters per minute per 1.73 square meters, notes MedlinePlus. The eGFR indicates how well the kidneys are filtering waste from the blood, and it is calculated using a formula that includes age, ethnicity, creatinine level, gender, height and weight. Doctors typically check an eGFR if a patient has diabetes, kidney problems, frequent urinary tract infections, heart disease or high blood pressure.