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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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Volume 39, Issue 9


Biological Variation of Interleukin-1β, Interleukin-8 and Tumor Necrosis Factor-α in Serum of Healthy Individuals

Concepción González / Fernando Cava / Antonio Ayllón / Paloma Guevara / José Alejandro Navajo / José Manuel González-Buitrago
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2001.139


Components of biological variation can be used to assess the usefulness of reference values, to evaluate the significance of changes in serial results from an individual and to define objective analytical goals. The aim of the study was to assess, in 15 healthy subjects studied at regular monthly intervals over a period of 6 consecutive months, the biological variation of interleukin-1β (IL-1β), interleukin-8 (IL-8), and tumor necrosis factor-α (TNF-α). Biological variation data (within-subject and between-subject coefficient of variation (CV)) were determined using a simple nested analysis of variance. Derived parameters (index of individuality, reliability coefficient and critical diferences) were calculated from within-subject and between-subject CV. The mean and standard deviation (SD), within-subject CV, between-subject CV, index of individuality and reliability coefficient were as follows: for IL-1β, 0.67 (0.32) pg/ml, 30%, 36%, 0.85, and 0.76; for IL-8, 3.68 (1.45) pg/ml, 24%, 31%, 0.85 and 0.75; and for TNF-α, 3.14 (1.87) pg/ml, 43%, 29%, 1.56 and 0.50, respectively. We conclude that between-subject variation and within-subject variation are quite similar for IL-1β and IL-8 and are relatively high for the three cytokines studied. Index of individuality is less than 1.4 for IL-1β and IL-8, and thus reference intervals based on population studies are of limited value. On the contrary, the index of individuality for TNF-α is greater than 1.4 and reference values can be used for diagnosis. Quality goals for imprecision are easily achieved for the three cytokines with current methodology.

About the article

Published Online: 2005-06-01

Published in Print: 2001-09-07

Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 39, Issue 9, Pages 836–841, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2001.139.

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