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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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ISSN
1437-4331
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Volume 41, Issue 7 (Jul 2003)

Issues

Clinical Evaluation of Nine Free Thyroxine Assays: Persistent Problems in Particular Populations

Michèle d'Herbomez / Gérard Forzy / Françoise Gasser / Catherine Massart / Andrée Beaudonnet / Rèmy Sapin
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2003.143

Abstract

Over the past decade, numerous papers have addressed the various methodological problems encountered with free thyroxine (FT4) assays. We evaluated the clinical performance of nine FT4 assays in five centres, using a panel of 310 sera: 156 from euthyroid controls; 27 from hyperthyroid patients; 34 from untreated hypothyroidism; 22 from patients with renal failure; 30 from women in the last trimester of pregnancy; 23 from patients on thyroid substitutive therapy; and 18 from patients treated with amiodarone.

Only three methods showed a Gaussian distribution of FT4 concentrations. Reference ranges were calculated using the 2.5th and 97.5th percentiles. A significant difference was observed between FT4 values in men and women. The areas under the receiver operating characteristic (ROC) curves ranged from 0.996 to 1 for hyperthyroidism and from 0.973 to 1 for hypothyroidism. In sera from patients with renal failure and from pregnant women, method-dependent biases were observed and confirmed with dilution experiments.

In conclusion, current FT4 assays show good performance regarding the diagnosis of overt dysthyroidism. Nevertheless, FT4 measurements are still vulnerable to method-dependent artefacts in particular populations such as patients with renal failure and pregnant women.

About the article

Published Online: 2005-06-01

Published in Print: 2003-07-21


Citation Information: Clinical Chemistry and Laboratory Medicine, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2003.143.

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