Comparison of creatinine and cystatin C for estimation of glomerular filtration rate in pediatric patients after Fontan operation.

The bedside Schwartz formula may be an overestimate of glomerular filtration rate in pediatric single-ventricle heart disease patients who have undergone the Fontan operation. While larger studies are necessary, cystatin C is a promising biomarker to replace creatinine and better estimate kidney function in this population.