Estimate your glomerular filtration rate (eGFR), a key measure of kidney function, from your age, gender and serum creatinine level using the 2021 CKD-EPI creatinine equation.
Google AdSense Banner
This area will contain advertisements after approval.
Google AdSense Banner
This area will contain advertisements after approval.
This calculator uses the 2021 CKD-EPI creatinine equation, the current race-free standard recommended by the National Kidney Foundation and American Society of Nephrology, which estimates GFR from serum creatinine, age and gender using published coefficients that differ slightly for men and women. The formula is eGFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^−1.2 × 0.9938^age × (1.012 if female), where κ (kappa) is 0.9 for men and 0.7 for women, and α (alpha) is −0.302 for men and −0.241 for women.
For example, a 45-year-old man with a serum creatinine of 1.0 mg/dL: Scr/κ = 1.0 ÷ 0.9 = 1.111. Since this is above 1, the min(…)^α term equals 1^−0.302 = 1, and the max(…)^−1.2 term equals 1.111^−1.2 ≈ 0.881. The age term is 0.9938^45 ≈ 0.756. Multiplying: 142 × 1 × 0.881 × 0.756 ≈ 94.6 mL/min/1.73m², which falls in the Normal (G1) stage.
GFR results are grouped into stages of chronic kidney disease (CKD): G1 (90+, normal), G2 (60-89, mildly decreased), G3a (45-59), G3b (30-44), G4 (15-29, severely decreased), and G5 (below 15, kidney failure). A single low result isn't a diagnosis, kidney function should be assessed by a healthcare provider using multiple readings and additional tests.
Drawing conclusions from a single eGFR reading, kidney function assessment normally requires multiple readings over time (typically at least 3 months apart) to distinguish a genuine trend from normal day-to-day variation.
Using a serum creatinine value from a different unit system (µmol/L instead of mg/dL) without converting first, this would produce a wildly incorrect eGFR.
Treating eGFR as equally accurate at very high values, the equation is less precise above roughly 60-90 mL/min/1.73m², where it's better at confirming normal function than at fine distinctions within the normal range.
No, this is an estimate for informational purposes only, based on a single equation and a single lab value. Always consult a healthcare provider for an actual kidney function assessment.
It's reported on a standard blood test (a basic or comprehensive metabolic panel) as 'creatinine', usually in mg/dL.
The 2021 CKD-EPI equation removed race from the calculation to address concerns that earlier race-based versions could lead to inequities in diagnosis and care, and it's now the recommended standard.
Google AdSense Banner
This area will contain advertisements after approval.