eGFR Equations
Reference details for every validated eGFR equation in the calculator. Each page covers the formula, constants, validated age range, clinical notes, and source references.
Adult equations
- Recommended
CKD-EPI 2021
2021
Latest race-free equation recommended by major nephrology organizations
- Recommended
CKD-EPI 2021 Cr-Cys
2021
Most accurate race-free equation using both creatinine and cystatin C
- Recommended
CKD-EPI 2021 CysC
2021
Latest race-free cystatin C equation from CKD-EPI group
- Recommended
EKFC
2021
European-developed equation with improved accuracy across full age spectrum
BIS
2012
Elderly-specific equation for patients ≥70 years
CKD-EPI 2009
2009
Previous version of CKD-EPI equation with race coefficient
CKD-EPI CysC
2012
eGFR calculation using cystatin C as biomarker
C-G
1976
Estimates creatinine clearance, useful for drug dosing
EKFC Cr-CysC
2023
Most accurate European equation combining creatinine and cystatin C
EKFC CysC
2023
European sex-free and race-free equation using cystatin C only
FAS
2016
Lifespan equation covering children to adults
Lund-Malmö
2011
European standard equation for eGFR calculation
MDRD-4 (IDMS)
2006
MDRD equation using IDMS-standardized creatinine
Pediatric equations
- Recommended
CKiD U25 Cr
2021
Age 1-25 years creatinine-based equation
- Recommended
CKiD U25 Cr-Cys
2021
Age 1-25 years combined biomarker equation - most accurate
- Recommended
Neonatal
2022
For term-born infants up to 4 weeks of age
- Recommended
Schwartz
2009
Bedside equation for children and adolescents
CAPA
2014
Cystatin C-based eGFR equation derived from the CAPA cohort (Caucasian, Asian, pediatric, and adult)
CKiD U25 Cys-C
2021
Age 1-25 years cystatin C-based equation
CKiD U25 Ext
2021
Extended equation for ages 1-30 years