<p><b>OBJECTIVE:</b> The objective of this study was to investigate the accuracy of a glomerular filtration rate (GFR) estimation equation based upon serum cystatin C (Hojs) and the abbreviated Modification of Diet in Renal Disease (MDRD) study and the Cockcroft-Gault (CG) corrected for body surface area (CG-BSA) estimation equations for detecting moderate chronic kidney disease against <sup>51</sup>Cr-EDTA cle...