Startseite A multicenter comparison of whole blood vitamin B6 assays
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A multicenter comparison of whole blood vitamin B6 assays

  • Bertrand D. van Zelst EMAIL logo , Roseri J.A.C. Roelofsen de Beer , Marjolein Neele , Snježana Kos , Ido P. Kema , Frans P.W. Tegelaers , Christa M. Cobbaert , Cas W. Weykamp und Robert de Jonge
Veröffentlicht/Copyright: 10. Oktober 2015
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Clinical Chemistry and Laboratory Medicine (CCLM)
Aus der Zeitschrift Clinical Chemistry and Laboratory Medicine (CCLM) Band 54 Heft 4

Abstract

Background: The aim of this study was to compare different analytical methods that are currently in use in the Netherlands for the measurement of whole blood vitamin B6.

Methods: This method comparison study consisted of two separate parts. (1) Four laboratories participated in a pilot study in which the commercial Chromsystems and INstruchemie method, and a laboratory developed liquid chromatography-tandem mass spectrometry (LC-MS/MS) method and HPLC method were compared. Sixty-nine frozen whole blood samples and six lyophilized whole blood samples were used for comparison. (2) In the nationwide part of the study, 49 laboratories participated in the analysis of three identical sets of two whole blood samples of which one set was freshly analyzed, one set was analyzed after storage at −20 °C and one set was analyzed after lyophilization.

Results: In both parts of the study, the HPLC and LC-MS/MS methods showed equivalent results for all sample types tested. The Chromsystems method showed a positive bias of 45% (pilot study) and 30% (nationwide study) towards the LC-MS/MS method when fresh or frozen samples were used. The measurement of lyophilized samples showed no differences between the methods. The results of the INstruchemie method were inconclusive due to the low number of participants.

Conclusions: The different analytical methods for measuring vitamin B6 produce different results when whole blood patient samples are measured. The recognition of a reference method or the development of suitable reference materials and quality control materials might serve as a first step towards improved standardization or harmonization of the whole blood vitamin B6 assay.

Keywords: HPLC; liquid chromatography-tandem mass spectrometry (LC-MS/MS); method comparison; pyridoxal-5′-phosphate (PLP); vitamin B6; whole blood
Corresponding author: Bertrand D. van Zelst, Department of Clinical Chemistry, Erasmus MC, PO Box 2040, 3000 CA Rotterdam, The Netherlands, Phone: +31107033587, Fax: +31104367894, E-mail:

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Supplemental Material:

The online version of this article (DOI: 10.1515/cclm-2015-0385) offers supplementary material, available to authorized users.

Received: 2015-4-22
Accepted: 2015-8-26
Published Online: 2015-10-10
Published in Print: 2016-4-1

©2016 by De Gruyter

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https://doi.org/10.1515/cclm-2015-0385
Schlagwörter für diesen Artikel
HPLC; liquid chromatography-tandem mass spectrometry (LC-MS/MS); method comparison; pyridoxal-5′-phosphate (PLP); vitamin B6; whole blood

Artikel in diesem Heft

  1. Frontmatter
  2. Editorial
  3. Macroprolactin: searching for a needle in a haystack?
  4. Review
  5. Laboratory medicine in the new healthcare environment
  6. Opinion Paper
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  15. Comparison between B·R·A·H·M·S PCT direct, a new sensitive point-of-care testing device for rapid quantification of procalcitonin in emergency department patients and established reference methods – a prospective multinational trial
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