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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

Online
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1437-4331
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Volume 42, Issue 1

Issues

Performance evaluation of automated assays for β-CrossLaps, N-MID-Osteocalcin and intact parathyroidhormone (BIOROSE Multicenter Study)

Heinrich Schmidt-Gayk / Eberhard Spanuth / Jochem Kötting / Reiner Bartl / Dieter Felsenberg / Johannes Pfeilschifter / Friedhelm Raue / Heinz Jürgen Roth
Published Online: 2005-06-01 | DOI: https://doi.org/10.1515/CCLM.2004.017

Abstract

Introduction: Biochemical markers of bone metabolism have been mainly determined manually until now and the precision and accuracy of these methods have not always been satisfactory. This has been shown in several external quality assessment schemes (EQAS).

Objective and study design: A study named BIOROSE was undertaken to evaluate new automated assays for serum markers of bone metabolism. The main focus was to evaluate the assay performance in a multicenter setting with 20 laboratories participating in Germany. The evaluation consists of a familiarization phase to determine precision and accuracy and an EQAS to evaluate the comparability between laboratories.

Materials: The parameters β-CrossLaps (CTX), N-MID-Osteocalcin (OC) and intact parathyroid hormone (PTH) were measured with reagents including calibrators and control sera obtained from Roche Diagnostics, Mannheim, Germany, with electrochemiluminescence immunoassays (ECLIA) on the automated analyzer Elecsys 2010.

Results: We calculated for the control samples, PCB 1-3, the mean and median values from the measured values of all participating laboratories and used these as target values. From these target values, a recovery range for the participating laboratories was calculated for β-CrossLaps, OC and intact PTH of better than 80–126% for PCB 2 and PCB 3, and for PCB 1 (low concentration range) for β-CrossLaps 79–129%, OC 90–120% and intact PTH 78–126%. The between-day imprecision was 2.4–7.2% for β-CrossLaps, 1.1–5.9% for OC and 1.7–5.5% for intact PTH in the elevated range (sample PCB 2). In the EQAS, the inter-laboratory imprecision for β-CrossLaps in the sample with a value of 0.8 ng/ml (above the upper limit of normal, which is 0.6 ng/ml) was 9.8% on day 1 and 9.7% on day 2.

Conclusion: The performance evaluation of automated assays for β-CrossLaps, N-MID-Osteocalcin and intact parathyroid hormone in the BIOROSE multicenter study showed that the participating laboratories had no problems in setting up these methods and they yielded results for precision and accuracy that are superior to results achieved in external quality assessment schemes for manually performed methods. In addition, at the clinically important decision level of the upper limit of the normal range, all three tested analytes gave precise results that improved medical decisions.

About the article

Published Online: 2005-06-01

Published in Print: 2004-02-16


Citation Information: Clinical Chemistry and Laboratory Medicine (CCLM), Volume 42, Issue 1, Pages 90–95, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2004.017.

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