ToolsCalculators
CKiD U25 eGFR calculator
Height/creatinine-based estimated GFR for children and young adults with CKD.
CKiD U25 eGFR calculator
Age
years
Sex
Height
Serum creatinine
Complete the fields above to see the result.
When to use
- Estimating GFR in children and young adults (age 1-25 years) with chronic kidney disease, including through the transition to young adulthood where the original CKiD bedside equation loses accuracy.
Formula
eGFR = K x height(m) / serum creatinine(mg/dL), with sex-specific constant K = 41.8 (male) or 37.6 (female). This is the constant-K form of the CKiD U25 height/creatinine equation; the original publication also derived an age-refined K and a parallel cystatin-C-based equation not implemented here.
Pearls and pitfalls
- Developed to correct underestimation of GFR by the original 2009 CKiD bedside equation in young children and young adults.
- A cystatin-C-based U25 equation from the same study may be combined with the creatinine-based estimate for improved accuracy.