eGFR levels by age: a chart with important caveats
Sheenam Midha · Health writer
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eGFR levels by age tend to decline across adulthood, but an age chart cannot diagnose chronic kidney disease. eGFR is an estimate built from a filtration marker and personal variables, and the most useful interpretation combines repeat results with urine albumin and clinical context.
Use our eGFR calculator to explore the 2021 CKD-EPI creatinine equation for adults. Your laboratory result should remain the starting point for clinical decisions.
Why eGFR changes with age
Kidney filtration tends to decrease with age, but people vary widely. The NIDDK publishes the following population means from NHANES III:
| Age | Population mean eGFR |
|---|---|
| 20-29 | 116 mL/min/1.73 m² |
| 30-39 | 107 mL/min/1.73 m² |
| 40-49 | 99 mL/min/1.73 m² |
| 50-59 | 93 mL/min/1.73 m² |
| 60-69 | 85 mL/min/1.73 m² |
| 70 and older | 75 mL/min/1.73 m² |
These are group averages, not minimum acceptable values. A younger person can have kidney disease at an eGFR above 60 when urine albumin or another marker shows damage. An older person with a stable result just below 60 and little albuminuria may have a different risk profile, but still deserves proper evaluation.
How eGFR is calculated
The current 2021 CKD-EPI creatinine equation uses serum creatinine, age, and sex. It does not use race. Creatinine is convenient, but muscle mass, diet, supplements, amputation, paralysis, frailty, and acute illness can change it independently of kidney filtration.
When a result sits near an important decision point, the NIDDK notes that combining creatinine with cystatin C improves accuracy and reduces bias compared with either marker alone.
eGFR categories and chronic kidney disease
| G category | eGFR | General description |
|---|---|---|
| G1 | 90 or higher | High or normal; CKD only if another marker of damage is present |
| G2 | 60-89 | Mildly decreased; CKD only if another marker is present |
| G3a | 45-59 | Mildly to moderately decreased |
| G3b | 30-44 | Moderately to severely decreased |
| G4 | 15-29 | Severely decreased |
| G5 | Below 15 | Kidney failure range |
CKD generally requires an abnormality for at least three months. Urine albumin-to-creatinine ratio is the second major marker because filtration and kidney damage are related but not identical.
How to interpret one unexpected result
Check whether you were acutely ill, dehydrated, hospitalized, or taking a medicine or supplement that affects creatinine. Compare with previous results and ask whether urine albumin was measured. Do not assume drinking excessive water will “flush” the kidneys or normalize a genuinely reduced filtration rate.
Our guide to how much water you should drink explains why fluid needs vary and why overhydration can also be harmful.
When to seek medical advice
Arrange follow-up for a new low eGFR, a meaningful downward trend, urine albumin, blood in urine, swelling, difficult-to-control blood pressure, or a family history of kidney disease. Seek urgent care for very low urine output, severe swelling with breathing trouble, confusion, or symptoms during an acute illness.
The bottom line
Age explains part of the expected variation in eGFR, but it should never be used to dismiss a result. Trends, urine albumin, repeat testing, and the limitations of the equation determine what the number means.
Evidence and review
How this article was checked
Population averages, CKD criteria, and equation limitations checked against NIDDK and National Kidney Foundation resources. This article has not been independently medically reviewed. Evidence last reviewed Aug 3, 2026.
- NIDDK - Demographics and eGFR Accuracy - NHANES population-average eGFR by age and current race-free equation context.
- NIDDK - Clinical Measurements and eGFR Accuracy - Limitations of creatinine-based estimates and situations where they are less reliable.
- National Kidney Foundation - CKD-EPI Creatinine Equation 2021 - Current adult creatinine-based equation and clinical-use notes.
FAQ
Frequently asked
Answers
Frequently asked questions
What is a normal eGFR for my age?
Population averages decline with age, but your result must be interpreted with urine albumin, repeat testing, medical history, and the equation used. An average is not a personal cutoff.
Does an eGFR below 60 always mean chronic kidney disease?
CKD generally requires an eGFR below 60 or another marker of kidney damage for at least three months. One result during illness or dehydration cannot establish chronicity.
Can muscle mass change eGFR?
Yes. Creatinine comes from muscle metabolism, so very high or low muscle mass can make creatinine-based eGFR less representative of actual filtration.
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