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Phosphatidylethanol (PEth) in blood samples from “driving under the influence” cases as indicator for prolonged excessive alcohol consumption

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Abstract

Phosphatidylethanol (PEth) is considered as specific biomarker of alcohol consumption. Due to accumulation after repeated drinking, PEth is suitable to monitor long-term drinking behavior. To examine the applicability of PEth in “driving under the influence of alcohol” cases, 142 blood samples with blood alcohol concentrations (BAC) ranging from 0.0–3.12 ‰ were analyzed for the presence of PEth homologues 16:0/18:1 (889 ± 878 ng/mL; range <LOQ to 5400 ng/mL) and 16:0/18:2 (355 ± 315 ng/mL; range <LOQ to 1440 ng/mL) by LC-MS/MS. With receiver operating characteristic analysis, PEth thresholds were evaluated to differentiate moderate and excessive alcohol consumption with acceptable sensitivity and specificity in accordance with the 1.6 ‰ BAC limit. With a threshold of 700 ng/mL for PEth 16:0/18:1, prolonged excessive alcohol consumption was detected in 65.9 % of drunk drivers with a BAC ≥ 1.6 ‰ and in 31.6 % of the samples with a BAC < 1.6 ‰. Similar results were obtained for PEth 16:0/18:2 with a threshold of 300 ng/mL. Both criteria, PEth 16:0/18:1 and PEth 16:0/18:2, were conform in the evaluation of drinking habits in 88.7 % of blood samples. These results show the possibility to detect prolonged excessive alcohol consumption, even if the BAC is below the legal threshold of 1.6 ‰ for driving aptitude assessment. As a consequence, concentrations of PEth 16:0/18:1 ≥ 700 ng/mL and of PEth 16:0/18:2 ≥ 300 ng/mL may be considered as indicators for the necessity of driving aptitude assessment in addition to BAC.

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Acknowledgments

We would like to thank Anja Kaiser, Nadine Utiger, Sidonia Guggisberg, Anita Iannone, Stefanie Salzmann, Severine Krönert, and Thomas Wüthrich from our institute for the determination of blood alcohol concentrations.

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Authors and Affiliations

  1. Institute of Forensic Medicine, Forensic Toxicology and Chemistry, University of Bern, Bühlstrasse 20, 3012, Bern, Switzerland

    Alexandra Schröck, Ana Hernández Redondo, Marie Martin Fabritius, Stefan König & Wolfgang Weinmann

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  1. Alexandra Schröck
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  2. Ana Hernández Redondo
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  3. Marie Martin Fabritius
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  4. Stefan König
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  5. Wolfgang Weinmann
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Correspondence to Alexandra Schröck.

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Schröck, A., Hernández Redondo, A., Martin Fabritius, M. et al. Phosphatidylethanol (PEth) in blood samples from “driving under the influence” cases as indicator for prolonged excessive alcohol consumption. Int J Legal Med 130, 393–400 (2016). https://doi.org/10.1007/s00414-015-1300-5

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  • DOI: https://doi.org/10.1007/s00414-015-1300-5

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