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Performance evaluation of a turbidimetric cystatin C assay on different high-throughput platforms
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Medical Sciences.
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2010 (English)In: Scandinavian Journal of Clinical and Laboratory Investigation, ISSN 0036-5513, Vol. 70, no 5, 347-353 p.Article in journal (Refereed) Published
Abstract [en]

Objective. The goal with this study was to evaluate the analytical performance of a new cystatin C immunoassay (Tina-quant (R) a Cystatin C, Roche Diagnostics GmbH). The evaluation was carried out at four centers according to a standardized protocol. Material and methods. The Tina-quant (R) a Cystatin C is a latex particle-enhanced immunoturbidimetric assay. Roche cobas (R) 6000, MODULAR ANALYTICS SWA and COBAS INTEGRA (R) instruments were included in the study. Method comparison studies were carried out against two turbidimetric methods (Dako Cystatin C, Gentian Cystatin C), and one nephelometric method (Siemens N-Latex Cystatin C). Results. Linearity was proven throughout the measuring range from 0.4 to 8 mg/L. Within-run CVs ranged from 0.7-2.8%, and total CVs from 1.4-4.7 % (concentration range 0.6-3.9 mg/L). Comparable results were obtained with paired serum and Li-heparinate plasma samples. Good agreement was achieved in the comparisons between the Tina-quant (R) a Cystatin C assay and the other commercially available cystatin C assays, two different turbidimetric methods (slope range 0.88-1.04, intercept < 0.17 mg/L, r >= 0.993) and one nephelometric assay (slope range 0.90-1.05, intercept < 0.21 mg/L, r >= 0.986). Conclusions. The Tina-quant (R) a Cystatin C assay was shown to be precise and accurate with proven linearity over the measuring range. Good comparability was obtained with other commercially available assays for the determination of cystatin C. The Tina-quant (R) a Cystatin C assay is very well suited for clinical use on routine clinical chemistry analysers to detect renal dysfunction with a 24 h availability.

Place, publisher, year, edition, pages
2010. Vol. 70, no 5, 347-353 p.
Keyword [en]
Cystatin C, estimated GFR, glomerular filtration rate, kidney, renal function, performance evaluation
National Category
Medical and Health Sciences
URN: urn:nbn:se:uu:diva-134662DOI: 10.3109/00365513.2010.491124ISI: 000282186000008OAI: oai:DiVA.org:uu-134662DiVA: diva2:373735
Available from: 2010-12-01 Created: 2010-11-30 Last updated: 2010-12-01Bibliographically approved

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