eGFR optimal range and reference range
Compiled by Alina Radu, founder of Sera, from the published sources below · Last reviewed November 9, 2026
Sera's bands for eGFR:
- Optimal 90 – 120 mL/min/1.73m² (90 – 120 mL/min/1.73m2); sufficient 60 – 90 mL/min/1.73m² (60 – 90 mL/min/1.73m2); out of range below 60 mL/min/1.73m².
Evidence grade: Established clinical threshold. A band edge that corresponds to a recognised diagnostic, risk or treatment threshold from a major clinical guideline or public-health body.
All units
| Unit | Optimal | Sufficient | Out of range |
|---|---|---|---|
| mL/min/1.73m² | 90 – 120 | 60 – 90 | below 60 |
| mL/min/1.73m2 | 90 – 120 | 60 – 90 | below 60 |
Bounded on the low side only — a high result is not treated as out of range. Laboratories report a high eGFR only as above 90, and no guideline sets an upper limit.
What the evidence says
Bands follow KDIGO's CKD categories: G1 at 90 and above, G2 from 60 to 89, reduced function below 60. A single eGFR does not establish chronic kidney disease; KDIGO requires the finding to persist for three months. eGFR falls with age in people without kidney disease: the National Kidney Foundation gives an average of 116 at ages 20 to 29, 85 at 60 to 69 and 75 at 70 and over, so a result of 60 to 89 in an older adult is the age norm. There is no accepted upper threshold, so high results are not flagged.
Sources
- Estimated Glomerular Filtration Rate (eGFR) — National Kidney Foundation, 2026 · Professional societyeGFR of 90 or higher is the normal range; 60 to 89 may mean early-stage kidney disease; 15 to 59 may mean kidney disease. Average eGFR falls with age, from 116 at 20 to 29 to 75 at 70 and over. Matches Sera's 90 and 60 edges; gives no upper limit.
- Clinical Practice Guideline for the Evaluation and Management of Chronic Kidney Disease — Kidney Disease: Improving Global Outcomes (KDIGO), 2024 · Clinical guidelineThe eGFR category boundaries Sera's bands follow: G1 ≥90, G2 60–89, and reduced function below 60 mL/min/1.73m².
- New Creatinine- and Cystatin C-Based Equations to Estimate GFR without Race — Inker LA, et al. — New England Journal of Medicine, 2021 · Peer-reviewed publicationThe CKD-EPI 2021 equation Sera uses to calculate eGFR from creatinine, age and sex.
What eGFR (Estimated) measures
An estimate of how well your kidneys filter waste from the blood. It is worked out from creatinine using the CKD-EPI 2021 formula. The name stands for estimated glomerular filtration rate.
Calculated: CKD-EPI 2021 formula (creatinine, age, sex)