GFR Calculator
Estimate your Glomerular Filtration Rate to assess kidney function.
Kidney Health
Staying hydrated and maintaining healthy blood pressure are the most effective ways to preserve long-term kidney function.
What is GFR?
Glomerular Filtration Rate (GFR) is a test used to check how well the kidneys are working. Specifically, it estimates how much blood passes through the glomeruli each minute. Glomeruli are the tiny filters in the kidneys that filter waste from the blood.
Interpreting eGFR Results
The estimated GFR (eGFR) is a calculated number based on your serum creatinine level, age, and gender. It is currently the most reliable way for doctors to identify the stage of chronic kidney disease (CKD) and monitor its progression over time.
Clinical Monitoring
Regular eGFR testing is essential for managing metabolic health and adjusting medication dosages to avoid renal toxicity.
MDRD Calculation Formula
GFR = 175 × (Scr)^-1.154 × (Age)^-0.203 × (0.742 if female) × (1.212 if African American)The MDRD (Modification of Diet in Renal Disease) equation is a widely used validated formula that provides an estimate of kidney function based on standard lab parameters.
Clinical Benchmarks
Normal Function
An eGFR of 90 or above is considered normal or high, indicating consistent and efficient waste filtration.
Stage 3 CKD
An eGFR between 30 and 59 indicates moderate kidney damage, requiring closer medical supervision and medication management.