eGFR Calculator

Category: Other Health

Calculate your Estimated Glomerular Filtration Rate (eGFR) to assess kidney function. This calculator uses the CKD-EPI equation which provides a more accurate estimate for people with higher eGFR levels.

Patient Information

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What Is the eGFR Calculator?

The eGFR Calculator is a kidney function tool that estimates your glomerular filtration rate (eGFR). This number reflects how efficiently your kidneys filter waste and excess fluid from your blood. It plays a key role in detecting early signs of chronic kidney disease (CKD) and tracking kidney Health over time.

This calculator is part of the ETG (Estimated Test Guide) platform, which focuses on providing fast, accessible clinical tools. Like a BAC estimation tool for alcohol levels or a Body Surface Area Calculator for dosing medications, this eGFR calculator supports informed health decisions without the need for complex medical software.

Formulas Used for eGFR Estimation

CKD-EPI (2009) Equation:
eGFR = 141 × min(Scr/κ, 1)^α × max(Scr/κ, 1)–1.209 × 0.993Age × Gender Factor × Race Factor

Where:
κ = 0.7 for females, 0.9 for males
α = –0.329 for females, –0.411 for males
Gender Factor = 1.018 for females, 1.0 for males
Race Factor = 1.159 if Black, 1.0 otherwise

How to Use the Calculator

This tool is simple and efficient. Follow these steps:

  • Enter your age (18 to 120 years).
  • Select your gender and race.
  • Input your serum creatinine value and unit (mg/dL or μmol/L).
  • (Optional) Add your height and weight for more accurate results using certain formulas.
  • Select the formula: CKD-EPI (default), MDRD, or Cockcroft-Gault.
  • Click “Calculate eGFR” to get results instantly.

What the Results Mean

Your eGFR result will be shown alongside its interpretation and CKD stage classification. Here’s a quick guide:

  • ≥ 90: Normal kidney function (Stage 1)
  • 60–89: Mildly reduced (Stage 2)
  • 45–59: Mild to moderate reduction (Stage 3a)
  • 30–44: Moderate to severe reduction (Stage 3b)
  • 15–29: Severe reduction (Stage 4)
  • < 15: Kidney failure (Stage 5)

The calculator also offers an explanation with health recommendations based on your result.

The Link Between ETG and eGFR

The ETG (Estimated Test Guide) framework brings together health calculators that estimate clinical values using standardized medical equations. Just like ETG tools such as the Body Type Calculator or Blood Pressure Calculator help users assess specific health markers, the eGFR calculator estimates kidney function quickly and clearly.

ETG calculators aim to improve awareness, promote prevention, and support self-monitoring. In the case of eGFR, early detection of kidney dysfunction allows for timely lifestyle changes or medical intervention—reducing the risk of progression to kidney failure.

Why Use This Tool?

  • Track your kidney function easily and without lab software.
  • Supports early detection of CKD when treatment is most effective.
  • Empowers discussions with your healthcare provider based on data.
  • Integrated with the ETG platform, ensuring reliable calculations.

FAQs

Is this calculator part of a medical diagnosis?

No. It’s an estimation tool. Only a licensed healthcare provider can diagnose kidney conditions using clinical data.

What if I don’t know my creatinine unit?

You can switch between mg/dL and μmol/L using the dropdown. If unsure, refer to your lab report or consult your doctor.

Do I need to include height and weight?

No, but including them improves accuracy for certain equations like Cockcroft-Gault.

How often should I check my eGFR?

It depends on your health history. People with conditions like Diabetes or hypertension may benefit from regular monitoring.

Conclusion

The eGFR Calculator within the ETG toolset helps you monitor kidney function with clarity and speed. Whether you're tracking a known condition or just staying informed, this tool supports better understanding of your renal health—and can prompt timely conversations with your healthcare provider.