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Publication Date:
January 2005
ISSN:
1437-4331
DOI:
10.1515/CCLM.2005.011

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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the International Federation of Clinical Chemistry and Laboratory Medicine and the European Federation of Clinical Chemistry and Laboratory Medicine

Editor-in-Chief: Plebani, Mario

Editorial Board Member: Lippi, Giuseppe / Gillery, Philippe / Kazmierczak, Steven / Lackner, Karl J. / Melichar, Bohuslav / Siest, Gérard / Whitfield, John B. / Abi Fadel, Marianne / Alvarez Menendez, Francisco V. / Azzazy, Hassan M.E. / Diamandis, Eleftherios P. / Eckardstein, Arnold / Favaloro, Emmanuel J. / Griesmacher, Andrea / Herrmann, Wolfgang / Hoffmann, Johannes J.M.L. / Hooijkaas, Herbert / Ichihara, Kiyoshi / Kaabachi, Naziha / Kim, Jeong-Ho / Korte, Wolfgang / Kroupis, Christos / Lai, Leslie Charles / Lam, Wai Kei Christopher / Marc, Janja / Miyoshi, Eiji / Özben, Tomris / Palicka, Vladimir / Panteghini, Mauro / Queralto, Jose M. / Scartezini, Marileia / Simundic, Ana-Maria / Tsongalis, Gregory J. / Wallemacq, Pierre E. / Yan, Shengkai / Young, Ian S. / Chiu, Rossa Wai Kwun / Ghosh, Debabrata / Kappelmayer, Janos / Lehmann, Sylvain / Sypniewska, Grazyna

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Interference of dextran in biuret-type assays of serum proteins

Joris R. Delanghe1 / Nicole Hamers2 / Youri E. Taes3 / Jean-Claude Libeer4

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Corresponding author: Prof. Dr. Joris Delanghe, Laboratory Clinical Chemistry 2P8, University Hospital Ghent, De Pintelaan 185, 9000 Ghent, Belgium Phone: +32-9-2402956, Fax: +32-9-2404985,

Citation Information: Clinical Chemical Laboratory Medicine. Volume 43, Issue 1, Pages 71–74, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: 10.1515/CCLM.2005.011, January 2005

Publication History:
Received:
July 20, 2004
Accepted:
October 22, 2004

Abstract

Dextran interference in biuret-type assays of total serum proteins was investigated in a Belgian National External Quality Assurance Survey with 256 participants. In vitro supplementation of therapeutic (10% Gentran 70 ®) dextran concentrations showed a broadly varying (from 0 to 20%) negative interference. The analytical interference was found to depend on both the sodium hydroxide and tartrate concentrations in the reagent formulation. The dry chemistry biuret method was not affected by the dextran interference. In a number of cases, the effects observed may be of clinical importance. Both clinicians and laboratory staff should be aware of the persistence of this analytical problem.

Keywords: biuret; dextran interference; plasma expanders; total protein assay

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