What Is eGFR in Blood Test Range? A Guide
The estimated glomerular filtration rate (eGFR) is a key blood test that measures how well your kidneys filter waste from your blood. Today, eGFR remains the standard marker for kidney function, reported as a number in milliliters per minute per 1.73 square meters (mL/min/1.73 m²). A normal eGFR range is typically 90 or above, but values vary by age, sex, and muscle mass. This guide explains the eGFR blood test range, what different levels mean, and how to interpret your results for proactive kidney care.
How eGFR Is Calculated and Reported
eGFR is derived from your serum creatinine level, age, sex, and race (though newer equations today often omit race for equity). The result is a single number that indicates kidney filtration efficiency. Labs report eGFR alongside creatinine in a comprehensive metabolic panel or renal function panel. The CKD-EPI creatinine equation is now widely used in the US, providing more accurate staging for all populations.
Normal eGFR Range by Stage
Kidney disease is staged based on eGFR. The table below outlines the standard ranges currently available:
| eGFR (mL/min/1.73 m²) | Kidney Function Stage | Interpretation |
|---|---|---|
| ≥90 | Stage 1 | Normal or high function; kidney damage may be present (e.g., proteinuria) |
| 60–89 | Stage 2 | Mildly decreased function; often asymptomatic |
| 45–59 | Stage 3a | Moderately decreased function; annual monitoring recommended |
| 30–44 | Stage 3b | Moderately to severely decreased function; nephrology referral advised |
| 15–29 | Stage 4 | Severely decreased function; prepare for dialysis or transplant |
| <15 | Stage 5 | Kidney failure; dialysis or transplant usually needed |
What Affects eGFR Results?
Several factors can temporarily alter eGFR without indicating chronic kidney disease:
- Hydration status – Dehydration lowers eGFR; overhydration raises it.
- Muscle mass – High muscle mass increases creatinine, lowering eGFR; low muscle mass does the opposite.
- Medications – NSAIDs, ACE inhibitors, and certain antibiotics can affect creatinine levels.
- Acute kidney injury – A sudden drop in eGFR may be reversible if treated promptly.
- Pregnancy – eGFR normally rises due to increased renal blood flow.
When to Order an eGFR Test
The US Preventive Services Task Force recommends eGFR testing for adults with hypertension, diabetes, cardiovascular disease, or a family history of kidney failure. Annual screening is prudent for those over 60. Lab Providers offers a comprehensive kidney panel that includes eGFR, creatinine, BUN, and electrolytes for a complete renal assessment.
Interpreting Your eGFR Range today
If your eGFR is between 90 and 120, your kidney function is generally healthy. Values consistently below 60 for three months or more indicate chronic kidney disease (CKD). A single low reading may be transient—repeat testing is essential. For example, a 45-year-old woman with an eGFR of 55 could have early CKD if confirmed, while a 75-year-old with the same number might be age-appropriate. Always discuss results with your healthcare provider.
eGFR and Race: Updated Equations
Today, most US labs use the CKD-EPI 2021 equation that excludes race adjustment. This change eliminates historical overestimation of kidney function in Black individuals, leading to earlier detection and treatment. The result is a more equitable assessment across all ethnic groups.
If you want a precise, lab-verified eGFR reading from a CLIA-certified provider, order our Kidney Function Panel with eGFR today. It includes creatinine, eGFR, BUN, and a detailed reference guide. Take control of your kidney health—visit our order page to get started.
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