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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 / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter / Tate, Jillian R.

12 Issues per year


IMPACT FACTOR 2016: 3.432

CiteScore 2016: 2.21

SCImago Journal Rank (SJR) 2016: 1.000
Source Normalized Impact per Paper (SNIP) 2016: 1.112

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1437-4331
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Volume 40, Issue 7

Issues

IFCC Primary Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes at 37°C. Part 7. Certification of Four Reference Materials for the Determination of Enzymatic Activity of γ-Glutamyltransferase, Lactate Dehydrogenase, Alanine Aminotransferase and Creatine Kinase according to IFCC Reference Procedures at 37°C

L. Siekmann / R. Bonora / C. A. Burtis / F. Ceriotti / P. Clerc-Renaud / G. Férard / C. A. Ferrero / J.-C. Forest / P. F. H. Franck / F.-J. Gella / W. Hoelzel / P. J. Jørgensen / T. Kanno / A. Kessner / R. Klauke / N. Kristiansen / J.-M. Lessinger / T. P. J. Linsinger / H. Misaki
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2002.127

Abstract

This paper is the seventh in a series dealing with reference procedures for the measurement of catalytic activity concentrations of enzymes at 37°C and the certification of reference preparations. Other parts deal with:

Part 1. The Concept of Reference Procedures for the Measurement of Catalytic Activity Concentrations of Enzymes; Part 2. Reference Procedure for the Measurement of Catalytic Concentration of Creatine Kinase; Part 3. Reference Procedure for the Measurement of Catalytic Concentration of Lactate Dehydrogenase; Part 4. Reference Procedure for the Measurement of Catalytic Concentration of Alanine Aminotransferase; Part 5. Reference Procedure for the Measurement of Catalytic Concentration of Aspartate Aminotransferase; Part 6. Reference Procedure for the Measurement of Catalytic Concentration of γ-Glutamyltransferase. A document describing the determination of preliminary reference values is also in preparation.

The certification of the catalytic activity concentrations as determined by the recently elaborated IFCC primary reference methods at 37°C of four enzyme preparations, namely IRMM/IFCC 452 γ-glutamyltransferase), IRMM/IFCC 453 (lactate dehydrogenase 1), IRMM/IFCC 454 (alanine aminotransferase) and IRMM/IFCC 455 (creatine kinase) is described. Homogeneity data were derived from previous results. Stability was assessed using recently obtained data as well as data from previous stability studies. The collaborative study for value assignment was performed under a strict quality control scheme to ensure traceability to the primary reference method. Uncertainty of the materials was assessed in compliance with the Guide to the Expression of Uncertainty in Measurement. The certified values obtained at 37°C are 1.90 μkat/l ± 0.04 μkat/l (114.1 U/l ± 2.4 U/l), for γ-glutamyltransferase, 8.37 μkat/l ± 0.12 μkat/l (502 U/l ± 7 U/l), for lactate dehydrogenase 1, 3.09 μkat/l ± 0.07 μkat/l (186 U/l ± 4 U/l), for alanine aminotransferase and 1.68 μkat/l ± 0.07 μkat/l (101 U/l ± 4 U/l), for creatine kinase. The materials are intended for internal quality control as well as for the evaluation of test systems as required by recent European Union legislation. Furthermore, the materials can be used to transfer accuracy from a reference method to a routine procedure provided the procedures exhibit the same analytical specificity and the certified materials are commutable.

About the article

Published Online: 2005-06-01

Published in Print: 2002-07-24


Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 40, Issue 7, Pages 739–745, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2002.127.

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