Estimated Glomerular Filtration Rate (eGFR) Calculator

What is Estimated Glomerular Filtration Rate (eGFR)?

The Estimated Glomerular Filtration Rate (eGFR) is a key indicator of kidney function. It measures how well your kidneys are filtering waste products from your blood, specifically estimating the volume of blood filtered by the glomeruli (tiny filters in the kidneys) per minute. This eGFR calculator provides this crucial value, standardized to a body surface area of 1.73m² (mL/min/1.73m²). A good eGFR value generally indicates healthy renal function.

Clinical Significance of eGFR Values (Based on KDIGO Guidelines) for Kidney Function

eGFR values are commonly used to stage Chronic Kidney Disease (CKD). Our eGFR calculator helps in understanding these stages:

• Stage G1: eGFR ≥ 90 mL/min/1.73m² (Normal or high kidney function, but other evidence of kidney damage like proteinuria may be present)
• Stage G2: eGFR 60–89 mL/min/1.73m² (Mildly decreased kidney function / renal function)
• Stage G3a: eGFR 45–59 mL/min/1.73m² (Mild to moderately decreased kidney function)
• Stage G3b: eGFR 30–44 mL/min/1.73m² (Moderate to severely decreased kidney function)
• Stage G4: eGFR 15–29 mL/min/1.73m² (Severely decreased kidney function)
• Stage G5: eGFR < 15 mL/min/1.73m² (Kidney failure, often requiring dialysis or kidney transplant)

Note: A single eGFR result from any eGFR calculator does not fully determine your kidney function status. Doctors consider other clinical indicators and medical history for a comprehensive assessment. This GFR calculator is a tool for estimation.

The CKD-EPI 2009 Creatinine Formula used in this eGFR Calculator

This eGFR calculator uses the 2009 Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) creatinine equation. This formula is widely considered one of the most accurate methods for estimating eGFR in adults, particularly for those with an eGFR > 60 mL/min/1.73m², offering better accuracy than the older MDRD formula. The CKD-EPI 2009 formula accounts for age, sex, serum creatinine level, and race (with an adjustment factor for Black individuals) to assess renal function.