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- W2126543133 abstract "Cystatin C is a low molecular weight cysteine proteinase inhibitor whose plasma or serum concentrations have been shown to be better correlated with glomerular filtration rate than serum creatinine concentrations. Routine assays for cystatin C are based on use of polyclonal antibodies and immunoturbidimetric and nephelometric designs. This study aimed to develop a double-monoclonal immunoassay for cystatin C.We tested functionality of 42 2-site antibody combinations involving 7 monoclonal antibodies with recombinant and plasma cystatin C. We developed a heterogeneous assay using 2 antibodies selected to give the best analytical performance. The assay used a dilution step and was based on a dry-reagent, all-in-one immunoassay concept with time-resolved fluorometry. The assay was performed on an automated immunoanalyzer in single wells that contained all the required assay components. We used heparin-derived plasma samples for methodological evaluation of the assay.From a relative epitope map involving 7 cystatin C-specific antibodies, we selected a pair of antibodies for a 2-site sandwich-type dry-reagent assay. Total assay time was 15 min, and 10 microL of a 100-fold diluted sample was used. The analytical detection limit (background + 3SD) and functional detection limit (CV 20%) were 0.01 mg/L and 0.02 mg/L, respectively. Within-run and total assay imprecision were <4.7% and <5.6% (at 0.84-3.2 mg/L), respectively, and plasma recoveries of added cystatin C were 94%-110%. Regression analysis with the Roche particle-enhanced immunoturbidimetric method yielded the following (SD): slope, 1.391 (0.029); y-intercept, -0.152 (0.045) mg/L; S(y logical or, bar belowx)=0.294 mg/L (n=131).The developed assay enables rapid and reliable measurement of cystatin C." @default.
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- W2126543133 date "2010-09-01" @default.
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- W2126543133 title "Dry-Reagent Double-Monoclonal Assay for Cystatin C" @default.
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- W2126543133 doi "https://doi.org/10.1373/clinchem.2009.141663" @default.
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