eGFR Calculator

What is eGFR?

The estimated Glomerular Filtration Rate (eGFR) is a calculation that estimates how well your kidneys are filtering waste from your blood. It is derived from your serum creatinine level, age, sex, and race using the CKD-EPI formula.

Unlike direct measurements, eGFR offers a convenient, non-invasive way to evaluate kidney function and is commonly used to screen for chronic kidney disease (CKD).

Why eGFR Matters

• Helps detect early signs of kidney damage
• Guides diagnosis and staging of chronic kidney disease (CKD)
• Assists in determining medication dosages that depend on kidney function

CKD Stages by eGFR

Stage	eGFR Range (mL/min/1.73m²)	Description
Stage 1	≥ 90	Normal function but with signs of kidney damage
Stage 2	60–89	Mildly reduced function with signs of kidney damage
Stage 3a	45–59	Mild to moderate decrease in kidney function
Stage 3b	30–44	Moderate to severe decrease in function
Stage 4	15–29	Severely decreased function
Stage 5	< 15	Kidney failure (end-stage renal disease)

Limitations

• Accuracy may vary in individuals with very high or low muscle mass
• Race-based adjustments may not be applicable for all populations
• Interpret eGFR alongside other tests like urine albumin and imaging

Always consult a healthcare professional for interpretation and next steps based on your eGFR result.

How to Use the eGFR Calculator

The eGFR (estimated Glomerular Filtration Rate) calculator estimates kidney function based on serum creatinine levels, age, gender, and race. It helps determine the stage of chronic kidney disease (CKD).

Steps to Use:

1. Enter Age:
   Provide your age in years.
2. Select Gender:
   Choose between Male and Female.
3. Select Race:
   Some eGFR equations use race as a factor. Select "Black" or "Non-Black" based on the input.
4. Enter Serum Creatinine:
   Input your latest serum creatinine value in mg/dL (as provided in your lab report).

Result Interpretation:

Once the values are entered, the calculator displays the estimated GFR in mL/min/1.73m², which can be compared to CKD staging criteria.

CKD Stages Based on eGFR:

• Stage 1: eGFR ≥ 90
• Stage 2: eGFR 60–89
• Stage 3a: eGFR 45–59
• Stage 3b: eGFR 30–44
• Stage 4: eGFR 15–29
• Stage 5: eGFR < 15 (kidney failure)

Important:

The calculator uses the CKD-EPI formula, which is widely accepted in clinical settings. However, eGFR is an estimate and should be interpreted in conjunction with your overall health, lab values, and your healthcare provider's guidance.