Kidney function education
eGFR by Age: Population Comparison
Compare an adult eGFR with published age-group averages without treating an average as a diagnostic cutoff or personal target.
KDIGO G categories are not adjusted for age. Trends, urine albumin, chronicity and the clinical setting determine interpretation. Age does not make a low or rapidly falling value automatically harmless.
Method and equation
The National Kidney Foundation publishes average eGFR values of 116 for ages 20–29, 107 for 30–39, 99 for 40–49, 93 for 50–59, 85 for 60–69 and 75 for 70+. Values are in mL/min/1.73 m². These are descriptive population averages; the table does not give reference intervals or a separate average for ages 18–19.
How to use this tool
- Enter age at testing and the indexed eGFR shown on the laboratory report. This tool compares an existing result; it does not calculate eGFR from age alone or predict a future decline.
- Review the original report, earlier results and relevant urine tests with a qualified clinician before making a care decision.
Worked example
At age 70, an entered eGFR of 62 is compared with the published 70+ average of 75. Being below that average does not by itself diagnose CKD; being close to it does not rule out kidney damage.
Understanding the result
KDIGO G categories are not adjusted for age. Trends, urine albumin, chronicity and the clinical setting determine interpretation. Age does not make a low or rapidly falling value automatically harmless.
Limitations and safety
- For adults only. Do not use the average to set treatment, decide whether testing is needed or dismiss symptoms. Differences in equations, populations and laboratory measurements limit individual comparisons.
- Educational use only. A result cannot diagnose disease or choose a medicine dose. Do not delay urgent care for symptoms or rapidly changing kidney results.
Sources
Method and explanations checked against the sources below on October 14, 2026. This is editorial and technical verification, not a physician review. External sources may be in English.