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eGFR Calculator

Calculate your estimated Glomerular Filtration Rate (eGFR) to assess kidney function using the CKD-EPI formula.

CKD Stages Based on eGFR:

Stage 1 (Normal)≥90 mL/min
Stage 2 (Mild)60-89 mL/min
Stage 3a (Mild-Mod)45-59 mL/min
Stage 3b (Mod-Severe)30-44 mL/min
Stage 4 (Severe)15-29 mL/min
Stage 5 (Failure)<15 mL/min

What is eGFR?

Estimated Glomerular Filtration Rate (eGFR) is a blood test that estimates how well your kidneys are filtering waste products from your blood. It's the best indicator of kidney function and is used to detect and monitor chronic kidney disease (CKD).

The CKD-EPI creatinine equation, used in this calculator, is the recommended formula by the National Kidney Foundation for estimating GFR from serum creatinine, age, sex, and race.

Normal eGFR is typically 90 or higher. Values below 60 may indicate kidney disease. Early detection of decreased kidney function allows for interventions that can slow or prevent progression.

Sources: National Kidney Foundation, Kidney Disease: Improving Global Outcomes (KDIGO)

How eGFR is Calculated

eGFR is calculated from serum creatinine (a blood test), age, sex, and race using the CKD-EPI equation. This calculator provides an estimate based on the inputs you provide.

  1. Obtain your serum creatinine value from a recent blood test.
  2. Enter your age, sex, and race as these factors affect normal kidney function.
  3. The CKD-EPI equation is applied to calculate eGFR.
  4. Results are reported in mL/min/1.73m².
  5. Remember: This is an estimate. Clinical evaluation is needed for diagnosis.

eGFR Categories (Kidney Disease Stages)

StageeGFR (mL/min/1.73m²)Description
Stage 190+ (with kidney damage)Kidney damage with normal or high GFR
Stage 260-89Mildly decreased kidney function
Stage 3a45-59Mild to moderately decreased
Stage 3b30-44Moderate to severely decreased
Stage 415-29Severely decreased kidney function
Stage 5<15 (or dialysis)Kidney failure

Limitations of eGFR Calculations

Protecting Your Kidney Health

Frequently Asked Questions

What is a normal eGFR value?

A normal eGFR is typically 90 mL/min/1.73m² or higher. Values between 60-89 may indicate mild decrease in kidney function. Values below 60 for 3 months or more suggest chronic kidney disease (CKD). Always consult a healthcare provider for interpretation.

Can eGFR improve?

Yes, eGFR can improve or stabilize with appropriate interventions, especially in earlier stages of kidney disease. Controlling blood pressure, managing diabetes, stopping smoking, and certain medications can help preserve kidney function. However, advanced kidney damage (Stage 4-5) is often not reversible.

Do I need to fast before an eGFR test?

No fasting is required for a standard eGFR blood test. However, your doctor may recommend fasting if other tests are being done simultaneously. Avoid eating excessive amounts of meat (which contains creatine) 24 hours before the test, and stay hydrated unless instructed otherwise.

What affects creatinine levels?

Creatinine levels are influenced by muscle mass, age, sex, race, diet (especially meat consumption), certain medications, and hydration status. Highly muscular individuals may have higher creatinine without kidney problems. This is why the eGFR formula adjusts for these factors.

When should I be concerned about my eGFR?

You should consult a healthcare provider if your eGFR is below 60, if it has decreased significantly from previous tests, or if you have symptoms like foamy urine, swelling in hands/feet, fatigue, or changes in urination frequency. Early intervention can slow progression of kidney disease.

Learn More

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