- A normal eGFR for most adults is about 90 to 120 mL/min/1.73 m2, and Cleveland Clinic puts a typical adult value at around 100; an eGFR of 60 or higher with no other signs of kidney damage is generally considered normal.
- eGFR falls naturally with age even in healthy kidneys, dropping from an average of about 116 mL/min/1.73 m2 at ages 20 to 29 to about 75 by age 70 and over (Cleveland Clinic).
- The 2021 CKD-EPI equation that calculates eGFR uses age and sex but no longer uses race, so a single creatinine value gives slightly different eGFR results for men and women (National Kidney Foundation).
Estimated glomerular filtration rate, or eGFR, is the single most useful number on a kidney blood panel. It estimates how many milliliters of blood your kidneys filter each minute. The tricky part is that a “good” eGFR for a 25 year old and a “good” eGFR for a 75 year old are not the same number. This guide gives you the real reference values by age and sex from authoritative sources, and explains when a result actually signals a problem.
Part of our Comprehensive Metabolic Panel guide.
What is a normal eGFR level?
For most healthy adults, a normal eGFR is roughly 90 to 120 mL/min/1.73 m2, and Cleveland Clinic describes a typical adult value as about 100. An important nuance often missed: an eGFR between 60 and 89 is classified as normal when there are no other markers of kidney damage such as protein in the urine, because mildly reduced numbers are common with age (National Kidney Foundation).
The number is reported in mL/min/1.73 m2, which standardizes the result to an average adult body surface area so people of different sizes can be compared. Labs rarely report eGFR values above 90 with an exact figure; many simply state “greater than 90” or “greater than 60” because the equation is most accurate in the lower, clinically important range. So a result that just reads “>90” is reassuring, not incomplete.
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eGFR normal range by age
Average eGFR declines steadily with age, falling from about 116 mL/min/1.73 m2 in your twenties to about 75 by age 70 and over (Cleveland Clinic). The table below shows the population average for each decade. These are typical values for people without kidney disease, not strict cutoffs, so your own healthy number can sit somewhat above or below the average for your age.
| Age group (years) | Average eGFR (mL/min/1.73 m2) | What it means |
|---|---|---|
| 20 to 29 | 116 | Peak kidney function |
| 30 to 39 | 107 | Still near peak |
| 40 to 49 | 99 | Gradual decline begins |
| 50 to 59 | 93 | Mild, expected drop |
| 60 to 69 | 85 | Lower but usually normal for age |
| 70 and over | 75 | Reduced filtration is common and often benign |
Source: Cleveland Clinic, eGFR average values by age. Values are population averages for people without kidney disease.
Notice the pattern: kidney function peaks between roughly age 25 and 35, then drifts downward by about 6 to 7 mL/min/1.73 m2 every decade after about age 35 to 40, a change documented in studies of healthy kidney donors (NCBI, Ageing and the Glomerular Filtration Rate). This is why a value of 75 can be perfectly healthy at 75 but worth investigating at 30.
How does sex change the range?
Sex shifts the result because the 2021 CKD-EPI equation, the formula nearly all US labs use, assigns slightly different coefficients to men and women: the constant is 142 for men and 143 for women, with different creatinine thresholds (0.9 mg/dL for men, 0.7 mg/dL for women) (Medscape, CKD-EPI 2021). The practical effect is that men and women with the same creatinine level usually get different eGFR numbers.
This sex adjustment exists because, on average, men carry more muscle mass than women, and muscle releases creatinine. Higher baseline creatinine in men is therefore expected and is built into the math rather than treated as a red flag. The 2021 update also removed race as a variable, a change adopted across US health systems because the older race coefficient overestimated eGFR in Black patients and could delay care (National Kidney Foundation).
- Men: tend to show modestly higher eGFR at the same creatinine because the equation accounts for greater muscle mass.
- Women: tend to show modestly lower creatinine but comparable eGFR once the formula adjusts.
- Both: the age based decline pattern applies equally; sex shifts the level, age shifts the trend.
What makes eGFR rise or fall with age?
eGFR falls with age mainly because the number of working filtering units, called nephrons, gradually drops and blood flow through the kidneys slows; the normal loss is roughly 0.7 to 1.0 mL/min per year after about age 40 (NCBI, Ageing and the Glomerular Filtration Rate). This is structural aging, not disease, and it happens even in people who never develop chronic kidney disease.
But the eGFR number can also move for reasons that have nothing to do with long term kidney health, which is why a single reading is never the whole story:
- Hydration and acute illness: dehydration, vomiting, or a fever can temporarily lower eGFR; rehydrating often brings it back up.
- Muscle mass and diet: very muscular people or those eating a large amount of cooked meat before the test can raise creatinine and lower the calculated eGFR without any kidney problem.
- Medications: some drugs, including certain blood pressure medicines and NSAIDs, can shift creatinine and eGFR.
- Chronic conditions: diabetes and high blood pressure accelerate the natural decline and are the leading drivers of true kidney damage.
Because of this variability, clinicians look for a sustained change across at least two readings about 90 days apart before diagnosing chronic kidney disease.
When is an out-of-range result a concern?
An eGFR result is most concerning when it stays below 60 mL/min/1.73 m2 for three months or longer, which meets the threshold for chronic kidney disease, or when any drop comes with protein in the urine or a falling trend over time (National Kidney Foundation). Cleveland Clinic stages kidney disease by eGFR as follows.
- Stage 1 (eGFR 90 or above): normal filtration; concern only if other signs of kidney damage are present.
- Stage 2 (eGFR 60 to 89): mildly reduced; often normal for age unless paired with damage markers.
- Stage 3 (eGFR 30 to 59): moderate loss of function; warrants monitoring and a care plan.
- Stage 4 (eGFR 15 to 29): severe loss; preparation for possible dialysis or transplant begins.
- Stage 5 (eGFR below 15): kidney failure; dialysis or transplant is usually needed (Cleveland Clinic).
The key questions your clinician will weigh: Is the number low for your age, or just low? Is it stable or falling? Is there protein in the urine? A single eGFR of 70 in a healthy 72 year old usually needs nothing more than routine follow up. The same number in a 35 year old with diabetes deserves a closer look.
Frequently asked questions
Is an eGFR of 60 bad?
Not necessarily. An eGFR of 60 to 89 is classed as normal when there are no other signs of kidney damage, and it is common with age. An eGFR of exactly 60 that is stable and has no protein in the urine is usually monitored rather than treated (National Kidney Foundation).
What is a normal eGFR for a 70 year old?
For people aged 70 and over, the average eGFR is about 75 mL/min/1.73 m2, according to Cleveland Clinic. Values somewhat below this can still be normal for age, especially when stable and without protein in the urine.
Can eGFR improve or go back up?
Yes, in some cases. eGFR that dropped from dehydration, illness, or certain medications often recovers once the cause is corrected. The gradual age related decline does not reverse, but treating diabetes and high blood pressure can slow further loss.
Does muscle mass affect eGFR?
Yes. Because creatinine comes from muscle, very muscular people can have higher creatinine and a lower calculated eGFR without any kidney problem. Eating a large amount of cooked meat shortly before the test can have a similar temporary effect.
Why did the eGFR formula remove race?
The 2021 CKD-EPI equation dropped race because the older race coefficient overestimated eGFR in Black patients and could delay diagnosis and care. US labs now use the race free version for everyone (National Kidney Foundation).
Sources
- Cleveland Clinic, Estimated Glomerular Filtration Rate (eGFR): Test and Levels
- National Kidney Foundation, Estimated GFR (eGFR) Test
- NCBI PMC, Ageing and the Glomerular Filtration Rate: Truths and Consequences
- Medscape, eGFR using CKD-EPI (2021 update)
This article is for general educational purposes and is not medical advice. It cannot diagnose or treat you and does not replace your clinician. Always discuss your lab results and any health decisions with a qualified healthcare professional.
