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Serum cystatin C as a determinant of glomerular filtration rate in children
Insights
Serum cystatin C offers a more accurate assessment of kidney function in children than creatinine. This biomarker shows stronger correlation and diagnostic accuracy for estimating glomerular filtration rate (GFR).
Area of Science:
- Pediatric Nephrology
- Clinical Chemistry
- Biomarker Discovery
Background:
- Accurate assessment of glomerular filtration rate (GFR) is crucial for diagnosing and managing kidney diseases in children.
- Serum creatinine is a commonly used marker for GFR estimation, but its accuracy can be affected by factors like age and muscle mass.
- Cystatin C is a protein produced by all nucleated cells, offering a potential alternative marker for GFR.
Purpose of the Study:
- To compare the diagnostic accuracy of serum cystatin C and serum creatinine for estimating GFR in children.
- To evaluate the correlation between serum cystatin C and creatinine levels with measured GFR in a pediatric population.
- To establish reference values for serum cystatin C in children aged 1-16 years.
Main Methods:
- Serum cystatin C and creatinine levels were measured in 69 children aged 1-16 years.
- Glomerular filtration rate (GFR) was determined using the gold standard Cr-EDTA clearance measurement.
- Statistical analyses included correlation studies and receiver-operating characteristic (ROC) curve analysis.
Main Results:
- Serum cystatin C demonstrated a significantly stronger correlation with GFR compared to serum creatinine (p < 0.05), especially in children with reduced GFR.
- ROC analysis revealed superior diagnostic accuracy for serum cystatin C in identifying reduced GFR.
- Reference values for serum cystatin C in children over one year of age were established as 0.63-1.33 mg/l, similar to adult values.
Conclusions:
- Serum cystatin C is a more reliable marker than serum creatinine for estimating GFR in children.
- Cystatin C offers improved diagnostic accuracy for detecting reduced GFR in pediatric populations.
- Serum cystatin C is a promising alternative to creatinine for routine GFR assessment in children and adults.
Abstract:
The serum levels of cystatin C and creatinine were determined in a population comprising 69 children, 1-16 years old, and including children with both normal and reduced glomerular filtration rate (GFR) as determined by Cr-EDTA clearance measurement. The overall correlation between the reciprocal cystatin C concentration and GFR was significantly stronger (p < 0.05) than that between the reciprocal creatinine concentration and GFR and this was true also for the subpopulation of children with reduced GFR. Receiver-operating characteristic analysis also indicated superior diagnostic accuracy of serum cystatin C compared to that of serum creatinine for reduced GFR. The serum cystatin C reference values (mean +/- 1.96 SD) determined for children over one year of age was 0.63-1.33 mg/l, which is similar to that previously determined for adults. Serum cystatin C appears to be an attractive alternative to creatinine for estimation of GFR not only in adults, but also in children.