Evidence-based|Sources: NIH, WHO, AHA, AGS clinical guidelines|Updated 2026
1 What is eGFR? ā–¾

eGFR (estimated glomerular filtration rate) is a lab estimate of how well your kidneys filter blood. Itā€™s calculated from blood creatinine plus age and sex; the most current equations do not use race. Trends over months matter more than a single number.

  • Higher eGFR is better. Lower numbers mean less filtering.
  • Albumin in urine (protein leak) adds risk information beyond eGFR alone.
  • Hydration, illness, and some medicines can temporarily change eGFR.
2 eGFR Stages (G1ā€“G5) Table ā–¾

Use this as a quick reference. Your clinician will tailor goals to your health conditions.

StageeGFR (mL/min/1.73mĀ²)Plain words
G1ā‰„ 90Normal/high eGFR (CKD possible if urine protein present)
G260ā€“89Mildly decreased (CKD if other signs like protein)
G3a45ā€“59Mildā€“moderately decreased
G3b30ā€“44Moderately to severely decreased
G415ā€“29Severely decreased
G5< 15Kidney failure (plan with specialist)

Always interpret together with albumin (A1ā€“A3), blood pressure, diabetes control, and symptoms.

3 Albumin Categories (A1ā€“A3) ā–¾

Urine albumin-to-creatinine ratio (ACR) checks if protein is leaking into urine. More protein typically means higher kidney and heart risk.

CategoryACR (mg/g)Plain words
A1< 30Normal to mildly increased
A230ā€“300Moderately increased
A3> 300Severely increased

Combining G (eGFR) and A (albumin) guides treatment intensity.

4 Quick eGFR Calculator (Educational) ā–¾

Educational onlyā€”not a diagnostic device. Results are estimates and may differ from your labā€™s calculation. Always rely on your clinicianā€™s interpretation.

Age (years)
Sex
Serum Creatinine (mg/dL)
Units
Calculate eGFR Clear

This uses a simplified creatinine-based, race-free equation similar in spirit to common lab formulas for adult outpatients.

5 Reading trends & when to repeat labs ā–¾

Trends matter

  • Compare several months, not one day.
  • Illness, dehydration, and some medicines can temporarily lower eGFR.
  • Share all over-the-counter drugs and supplements with your clinician.
Repeating labs: Your clinician may repeat in weeks to months depending on stage, albumin level, and changes in medicines or symptoms.
6 Protecting kidneys & heart (daily steps) ā–¾

Blood pressure

  • Accurate home checks, calm posture, same times daily when adjusting treatment.
  • Share averages (morning/evening over several days).

Salt & meals

  • Taste first; use herbs/lemon instead of extra salt.
  • Limit processed meats, instant soups, sauces.
  • Ask about potassium/phosphorus limits for your stage.

Movement & sleep

  • Walk 5ā€“10 minutes after meals; add gentle strength and balance.
  • Consistent bedtime; cool, dark room; safe night light.
7 Medicines & what to avoid ā–¾

Often used (individualized)

  • ACE inhibitor or ARB (especially with albumin leak)
  • SGLT2 inhibitor (for many with diabetes; sometimes without)
  • Diuretics (ā€œwater pillsā€) for salt/fluid control
  • Statins to reduce heart risk
Use with caution / avoid unless cleared:
  • Many NSAIDs pain pills (over-the-counter) can worsen kidney function and raise BP
  • Herbal products with unknown kidney effects
  • Contrast dye scans without kidney-safe planning

Never start/stop medicines on your ownā€”doses depend on eGFR, potassium, and other conditions.

8 FAQs ā–¾

What eGFR is considered ā€œkidney failureā€?

eGFR < 15 (G5) is considered kidney failure. Planning with a kidney specialist usually starts earlier (G4) so decisions are calm and personalized.

Can dehydration lower eGFR temporarily?

Yes. Illness and dehydration can temporarily lower eGFR. Your clinician may repeat labs when youā€™re well and hydrated.

Does muscle mass affect creatinine?

Yes. Low muscle mass can make creatinine lower and eGFR seem higher than true filtration. Clinicians interpret results in context.

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Educational content only. Always follow your clinicianā€™s advice for your personal targets, medicines, and diet.
Medical DisclaimerThis article is for educational purposes only and is not a substitute for professional medical advice. Always consult your doctor before starting supplements or changing medications. Learn about our editorial process.
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