Estimated glomerular filtration rate (CKD-EPI 2021)
Enter the creatinine from your blood test, its unit, your age and sex. The tool applies the CKD-EPI 2021 equation used by many laboratories. Only a health professional can interpret this figure.
General information, not medical advice. This result does not replace a doctor. If in doubt or if you have symptoms, see a health professional.
Result
69Estimated GFR (mL/min/1.73 m²)
- Creatinine (mg/dL)
- 1
- This figure falls in the KDIGO reference category G2 (60 to 89).
- This is not a diagnosis: chronic kidney disease is only concluded from repeated measurements over more than 3 months and other tests (albuminuria in particular).
- Show this result to your doctor, who will interpret it with your situation and treatments.
Inputs
- Blood creatinine
- 1
- Unit
- mg/dL
- Age
- 50
- Sex (for the formula)
- Woman
How it is calculated
Creatinine in µmol/L ÷ 88.4 = creatinine in mg/dL (Scr).
Result
Estimated GFR (mL/min/1.73 m²)
- Creatinine (mg/dL)
- 1
How it is calculated
- Creatinine in µmol/L ÷ 88.4 = creatinine in mg/dL (Scr).
- GFR = 142 × min(Scr/κ, 1)^α × max(Scr/κ, 1)^−1.200 × 0.9938^age × 1.012 for women.
- Women: κ = 0.7 and α = −0.241. Men: κ = 0.9 and α = −0.302.
Example
Creatinine 1.0 mg/dL, woman aged 50: estimated GFR 69 mL/min/1.73 m² (reference category G2).
Good to know
- Less reliable with unusual muscle mass (amputation, very muscular athlete, undernutrition), during pregnancy or when kidney function changes quickly.
- Not to be used alone to adjust a medicine dose.
- For adults only; other equations exist for children.
Sources
- Inker L.A. et al., New creatinine- and cystatin C-based equations to estimate GFR without race, NEJM, 2021
- KDIGO 2024 Clinical Practice Guideline for the Evaluation and Management of CKD
Frequently asked questions
What is this tool used for?
Enter the creatinine from your blood test, its unit, your age and sex. The tool applies the CKD-EPI 2021 equation used by many laboratories. Only a health professional can interpret this figure.
How is the result calculated?
Creatinine in µmol/L ÷ 88.4 = creatinine in mg/dL (Scr).
What should I check before using the result?
Less reliable with unusual muscle mass (amputation, very muscular athlete, undernutrition), during pregnancy or when kidney function changes quickly.