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Three commercial HCV nucleic acid amplification techniques (HCV\u2013NAT) were compared for quantitation consistency of genotype 4 and 1 specimens from an Egyptian blood donor panel (n\u2009=\u200992). Consistency of quantitation between HCV\u2013NATs was higher for genotype 1 than for genotype 4. Most quantitative results reported by the assays were in the same range, but some genotype 4 samples were missed by two of the assays. The Abbott assay showed higher concentrations for genotype 4 than the two Roche assays. Follow\u2010up investigations of individuals should use the same assay unless another assay has been validated properly. Standardization of HCV\u2013NAT assays remains an issue. J. Med. Virol. 80:2086\u20132091, 2008. \u00a9 2008 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/jmv.21325","type":"journal-article","created":{"date-parts":[[2008,10,21]],"date-time":"2008-10-21T13:54:44Z","timestamp":1224597284000},"page":"2086-2091","source":"Crossref","is-referenced-by-count":3,"title":["Consistency of quantitation of HCV genotype 4 from egypt across three HCV\u2010RNA amplification assays"],"prefix":"10.1002","volume":"80","author":[{"given":"Fathia Zaky El","family":"Sharkawi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael","family":"Chudy","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kay\u2010Martin","family":"Hanschmann","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Julia","family":"Kress","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"C. 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