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[Formula creatinine clearance as a substitute for 24-hour creatine clearance in children with kidney transplantation]
C Aufricht1, A Balbisi, C Gerdov
1Kinderdialyse, Univ. Kinderklinik Wien.
Insights
Formula-based creatinine clearance is more reproducible than 24-hour urine collection in pediatric kidney transplant patients. This study supports wider clinical use of formula creatinine clearance for improved accuracy in patient care.
Area of Science:
- Nephrology
- Pediatric Nephrology
- Clinical Chemistry
Context:
- 24-hour urine collection for creatinine clearance is complex and prone to significant collection errors.
- Formula-based creatinine clearance, like the Schwartz formula, offers theoretical advantages but lacks widespread clinical adoption.
- Accurate assessment of renal function is critical in pediatric patients, especially post-renal transplantation.
Purpose:
- To compare the accuracy and reproducibility of measured 24-hour creatinine clearance versus formula-based creatinine clearance in pediatric renal transplant recipients.
- To evaluate the long-term performance of formula-based creatinine clearance in a cohort of children following kidney transplantation.
Summary:
- This study observed 27 pediatric renal transplant patients over an average of 11.7 months, comparing measured and computed creatinine clearance.
- A wide scatter was found between measured and computed values, with a 90% confidence interval of -30% to +60%.
- Formula creatinine clearance demonstrated significantly better reproducibility (SD 17.8%) compared to 24-hour urine collection (SD 37.8%), with lower intra-individual collection errors.
Impact:
- The findings suggest that 24-hour creatinine clearance may be less accurate than its procedural complexity implies.
- Formula creatinine clearance is more reproducible and potentially more accurate for routine pediatric use, especially in post-transplant monitoring.
- Supports broader clinical acceptance and implementation of formula-based creatinine clearance in pediatric nephrology practice.
Abstract:
Despite many theoretical advantages, formula-creatininclearance (Schwartz et al, Journal of Pediatrics 1976) has not found broad clinical acceptance in everyday pediatric patient care. In this study we report our results of long term observations (11.7 +/- 6.8 (1.7-24.8) months) of measured and computed creatininclearance in 27 children after renal transplantation (15 boys, 12 girls, mean age 14.5 +/- 4.2 (5.5-20) years) at the Kinderdialyse of the Universitäts-Kinderklinik of Vienna. We found a wide scattered correlation between the measured and computed creatininclearance values with a 90% confidence interval between -30% to +60% of the 24 hour creatininclearance. Formula creatininclearance (SD 17.8%) was markedly better reproducable than the 24 hour creatininclearancethe (SD 37.8%), the intraindividuell collecting error (36.1%) was almost twice the interindividuell "coefficient" error (20.27%). We therefore conclude that the 24 hour creatininclearance is by far not as accurate as the complexity of the procedure pretends and support broad clinical acceptance for the formula creatininclearance.