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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Greaves, Ronda / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter


IMPACT FACTOR 2018: 3.638

CiteScore 2018: 2.44

SCImago Journal Rank (SJR) 2018: 1.191
Source Normalized Impact per Paper (SNIP) 2018: 1.205

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ISSN
1437-4331
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Volume 37, Issue 10

Issues

International Federation of Clinical Chemistry and Laboratory Medicine (IFCC) Standardization Project for the Measurement of Lipoprotein(a). Phase 2: Selection and Properties of a Proposed Secondary Reference Material for Lipoprotein(a).

Jillian R. Tate / Kåre Berg / Rémy Couderc / Francesco Dati / Gert M. Kostner / Santica M. Marcovina / Nader Rifai / Ikunosuke Sakurabayashi / Armin Steinmetz
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.1999.140

Abstract

The International Federation of Clinical Chemistry and Laboratory Medicine Working Group for the Standardization of Lipoprotein(a) Assays has initiated a project to select a secondary reference material for lipoprotein( a) that can standardize the measurement of this lipoprotein. Most of the analytical problems with lipoprotein( a) assays are due to apolipoprotein(a) kringle 4 type 2 reactive antibodies and values being expressed in mg/l mass units rather than as nmol/l of apolipoprotein( a) particles. In Phase 2, four manufactured materials were compared for analytical performance, commutability properties and method harmonization in 27 lipoprotein(a) test systems. Results of precision and linearity testing were comparable for all materials whereas testing for the harmonization effect resulted in an among-assay coefficient of variation for corrected lipoprotein(a) values of between 11% and 22%. The material that gave maximum harmonization achieved a variation of < 8% for 18 immunonephelometric and immunoturbidimetric assay systems. It can be hypothesized that this residual variation in part takes into account the inaccuracy of lipoprotein(a) measurement due to apolipoprotein(a) size polymorphism. On the basis of acceptable analytical performance, maximal harmonization effect and documented stability, a lyophilized material has been selected as the common calibrator for lipoprotein(a) to be used in a value transfer procedure by diagnostic companies.

About the article

Published Online: 2005-06-01

Published in Print: 1999-10-15


Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 37, Issue 10, Pages 949–958, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.1999.140.

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