Clinical Chemistry
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Clinical Chemistry 52: 1612-1614, 2006; 10.1373/clinchem.2005.064683
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(Clinical Chemistry. 2006;52:1612-1614.)
© 2006 American Association for Clinical Chemistry, Inc.

Letters to the Editor

Magnesium Contamination from Terumo Blood Collection Tubes

Goce Dimeskia and Andrew Carter

Department of Chemical Pathology, Queensland Health, Pathology Service, Princess Alexandra Hospital, Woolloongabba, Queensland 4102, Australia

aAddress correspondence to this author at: Department of Chemical Pathology, Queensland Health Pathology Service, Princess Alexandra Hospital, Ipswich Road, Woolloongabba, Queensland 4102, Australia. Fax 61-7-3240-7070; e-mail Goce_Dimeski@health.qld.gov.au.

The first 20% of the full text of this article appears below.


To the Editor:

Components of blood collection tubes have been implicated as interfering substances in various assays, especially immunoassays (1)(2)(3)(4)(5). Possible interfering components for blood collection tubes include the lubricants, clot activators, surfactants, and barrier gels. In 1 study, a surfactant was identified as the interferent (1). To our knowledge, no problems have been reported with general chemistry assays. Here we describe an apparent contamination of Terumo tubes with magnesium.

In an evaluation of collection tubes, we collected samples from volunteers via a Vacutainer system into 3 tubes (Greiner, BD, or Terumo). The samples were obtained with no conscious order of draw, and the 3 types of tubes were treated identically. The fill volume of drawn blood was 5–7 mL for all tubes. The samples were stored at room temperature (~21 °C) for <45 . . . [Full Text of this Article]






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