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Comparison of Estimated GFR Using Cystatin C Versus Creatinine in Pediatric Kidney Transplant Recipients

Pediatric Nephrology(2024)

Department of Pediatrics | Children’s Hospital of Orange County | University of Rochester Medical Center | Phoenix Children’s Hospital | David Geffen School of Medicine at UCLA | Duke University School of Medicine

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Abstract
An accurate, rapid estimate of glomerular filtration rate (GFR) in kidney transplant patients affords early detection of transplant deterioration and timely intervention. This study compared the performance of serum creatinine (Cr) and cystatin C (CysC)-based GFR equations to measured GFR (mGFR) using iohexol among pediatric kidney transplant recipients. CysC, Cr, and mGFR were obtained from 45 kidney transplant patients, 1–18 years old. Cr- and CysC-estimated GFR (eGFR) was compared against mGFR using the Cr-based (Bedside Schwartz, U25-Cr), CysC-based (Gentian CysC, CAPA, U25-CysC), and Cr-CysC combination (CKiD Cr-CysC, U25 Cr-CysC) equations in terms of bias, precision, and accuracy. Bland–Altman plots assessed the agreement between eGFR and mGFR. Secondary analyses evaluated the formulas in patients with biopsy-proven histological changes, and K/DOQI CKD staging. Bias was small with Gentian CysC (0.1 ml/min/1.73 m2); 88.9
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Key words
Kidney function,Estimating equations,Bias,Accuracy,Precision
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