Information about a laboratory test
eGFR is used to categorize kidney function from G1 to G5; the category alone is not a CKD diagnosis and is interpreted with UACR and chronicity.
An estimate of how well the kidneys filter blood, usually calculated from serum creatinine and personal characteristics.
Used to screen kidney function, classify chronic kidney disease and monitor change over time.
A single low eGFR can occur for acute or chronic reasons; persistence and other markers of kidney damage matter when evaluating CKD.
A high eGFR is not usually categorized as a problem by itself; physiology and estimation limitations may affect the result.
Start with the performing laboratory's reference interval, unit and specimen conditions. Numeric information on this page is stored as sourced example intervals or clinical thresholds.
>= 90 mL/min/1.73 m²
G1: normal or high
This record is one of the CKD G categories for eGFR. G1 or G2 alone does not establish CKD; chronicity and UACR/other evidence of kidney damage also matter.
>= 60 – <= 89 mL/min/1.73 m²
G2: mildly decreased
This record is one of the CKD G categories for eGFR. G1 or G2 alone does not establish CKD; chronicity and UACR/other evidence of kidney damage also matter.
>= 45 – <= 59 mL/min/1.73 m²
G3a: mildly to moderately decreased
This record is one of the CKD G categories for eGFR. G1 or G2 alone does not establish CKD; chronicity and UACR/other evidence of kidney damage also matter.
>= 30 – <= 44 mL/min/1.73 m²
G3b: moderately to severely decreased
This record is one of the CKD G categories for eGFR. G1 or G2 alone does not establish CKD; chronicity and UACR/other evidence of kidney damage also matter.
>= 15 – <= 29 mL/min/1.73 m²
G4: severely decreased
This record is one of the CKD G categories for eGFR. G1 or G2 alone does not establish CKD; chronicity and UACR/other evidence of kidney damage also matter.
< 15 mL/min/1.73 m²
G5: kidney failure category
This record is one of the CKD G categories for eGFR. G1 or G2 alone does not establish CKD; chronicity and UACR/other evidence of kidney damage also matter.
Reference ranges may vary by laboratory, method used, age, sex, pregnancy status, and clinical context. The reference range on your own laboratory report takes precedence.
eGFR categories are not a diagnosis on their own. Especially in G1-G2, evidence of kidney damage and information such as UACR are needed.
Creatinine Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Creatinine limitations and use with eGFR, BUN and urine testing · Verified: Aug 12, 2026
Uric Acid Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Uric acid interpretation, sex-specific example intervals and gout treatment targets · Verified: Aug 12, 2026
Potassium Blood Test — U.S. National Library of Medicine (MedlinePlus)
Government medical reference · 2026 · Potassium interpretation, kidney and medication context · Verified: Aug 12, 2026
Chronic Kidney Disease Tests & Diagnosis — National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
U.S. government medical reference · 2026 · eGFR and urine albumin/UACR as key kidney tests; broad interpretation thresholds · Verified: Aug 12, 2026
Estimated GFR Calculators / Laboratory Evaluation — National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)
U.S. government medical reference · 2026 · Creatinine-based eGFR, race-free CKD-EPI recommendation and limitations · Verified: Aug 12, 2026
How to Classify CKD — National Kidney Foundation
Professional clinical reference · 2026 · G1-G5 eGFR categories and A1-A3 albuminuria categories · Verified: Aug 12, 2026
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