CKiD U25 Extended
Pediatric2021
Extended equation for ages 1-30 years
Calculate CKiD U25 Ext
Enter the values required by this equation to estimate the result.
Enter all required values to see the result.
For educational and clinical reference use. Interpret results in clinical context.
Formula
Formula constants
| Symbol | Description | Value |
|---|---|---|
| Age- and sex-dependent coefficient (Female) | Age 1 to <12:36.1 × 1.008^(age − 12) Age 12 to <18:36.1 × 1.023^(age − 12) Age 18–25:41.4 Age 26–30:41.4 × 0.995^(age − 25) | |
| Age- and sex-dependent coefficient (Male) | Age 1 to <12:39.0 × 1.008^(age − 12) Age 12 to <18:39.0 × 1.045^(age − 12) Age 18–25:50.8 Age 26–30:50.8 × 0.995^(age − 25) | |
Heightinput | Patient height | meters |
| input | Serum creatinine | mg/dL |
Required inputs
AgeSexHeightCreatinine
Validated age range
1 to 30 years
Limitations
- Research-stage extension of CKiD U25
- Limited validation beyond age 25
- Designed for mild-to-moderate CKD populations
- May not be appropriate for screening asymptomatic patients
Clinical notes
- Extended CKiD equation for ages 1-30 years
- Prevents 'jumps' when transitioning to adult equations
- Superior estimation across extended pediatric and young adult spectrum
- No race-based modifiers required
- Research-stage extension of CKiD U25
References
- [1]Pierce CB, Muñoz A, Ng DK, Warady BA, Furth SL, Schwartz GJ. Age- and sex-dependent clinical equations to estimate glomerular filtration rates in children and young adults with chronic kidney disease. Kidney Int. 2021;99(4):948-956. doi:10.1016/j.kint.2020.10.047
- [2]Ng DK, Pierce CB. Kidney disease progression in children and young adults with pediatric CKD: Epidemiologic perspectives and clinical applications. Semin Nephrol. 2021;41(5):405-415. doi:10.1016/j.semnephrol.2021.09.002