eGFR
eGFR is an estimate of how many milliliters of blood your kidneys clear per minute — calculated from creatinine, age and sex. It is the most practical measure of kidney function.
| Rating | Range | What it means |
|---|---|---|
| Good | 90 ml/min/1,73m² and above | The kidneys are filtering optimally (G1, ≥90). |
| Worth improving | 60 ml/min/1,73m² and above | Mildly reduced (G2, 60–89) — often with age; monitor. |
| Talk to a doctor | below 60 ml/min/1,73m² | Reduced (<60, G3+) — consult your doctor. |
Why it matters
Per KDIGO, the foundation of kidney assessment; eGFR <60 (for ≥3 months) or albuminuria means chronic kidney disease.
If it’s low
Low eGFR means less filtration reserve in the kidneys. A mild reduction is common (age) and we monitor it; persistently below 60 (3 months) defines chronic kidney disease.
If it’s high
A high/normal eGFR is favorable. A very high value may just be an artifact of low muscle mass.
What to do
Mild reduction: enough fluids, control of blood pressure and blood sugar, caution with NSAIDs. Persistently low (below 60, 3 months) → seek advice and regular monitoring.
Read together with
Creatinine · Microalbumin (urine) · Cystatin C · Uric acid
Part of the guide: Kidneys & electrolytes →
Articles about this marker
- Blood chemistry tests: normal values for ALT, AST, GGT, CRP, CK, creatinine and glucoseReading your report
- High BUN or urea: what it means, with creatinine and the BUN/creatinine ratioMarker explained
- High homocysteine: what it means and how to lower itMarker explained
- Kidneys: eGFR and creatinine — what they mean and how to protect themMarker explained
- Potassium high or low? What your potassium and sodium results meanMarker explained
- Preventive blood testing for longevity: what to test and how oftenSupplements & longevity
This content is for information only and is not a substitute for medical advice. Talk to your doctor about your results.
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