GFR Calculator

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

Frequently Asked Questions

What is GFR?

GFR (Glomerular Filtration Rate) is a measure of how well your kidneys are filtering blood. It estimates how much blood passes through the glomeruli (tiny filters in your kidneys) each minute. A lower GFR number means your kidneys aren't working as well as they should.

How is eGFR calculated?

The estimated GFR (eGFR) is calculated using the CKD-EPI equation, which takes into account your serum creatinine level, age, gender, and race. This formula provides a more accurate estimate than older methods, especially for people with higher GFR values.

What do the GFR results mean?

GFR results are typically categorized as follows: G1 (≥90 mL/min): Normal or high kidney function, G2 (60-89 mL/min): Mildly decreased function, G3a (45-59 mL/min): Mild to moderately decreased function, G3b (30-44 mL/min): Moderately to severely decreased function, G4 (15-29 mL/min): Severely decreased function, G5 (<15 mL/min): Kidney failure.

Why is race a factor in GFR calculation?

Race is included in the calculation because studies have shown that, on average, Black individuals have higher creatinine levels for the same level of kidney function compared to non-Black individuals. However, there is ongoing debate about whether race should be included in medical calculations.

How often should I check my GFR?

If you have risk factors for kidney disease (such as diabetes, high blood pressure, or a family history of kidney problems), your doctor may recommend checking your GFR annually. For those with known kidney issues, more frequent testing may be necessary.