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In 2022, the first international consensus for the use of PEth and its interpretation was published. To establish an experience\u2010based foundation for further harmonization, three rounds of interlaboratory comparison using microsamples were conducted. Participating laboratories sent their sampling devices to the laboratory of Forensic Toxicology at the University of Bern, where for each round, four different authentic blood samples were applied to the devices and sent back. The PEth 16:0\/18:1 target concentrations covered a range between 16 and 474\u2009ng\/mL (0.023 and 0.676\u2009\u03bcmol\/L, respectively) and included sample concentrations close to the decision limits of 20 and 200\u2009ng\/mL (0.025 and 0.28\u2009\u03bcmol\/L, respectively). Evaluation of the results based on guidelines by Horwitz and the Society of Toxicological and Forensic Chemistry (GTFCh) showed that 73% of all participating laboratories quantified and reported all samples (<jats:italic>N<\/jats:italic>\u2009=\u20094 for each round) within the acceptable limits. More than 90% quantified and reported at least one sample within the acceptable limits.<\/jats:p>","DOI":"10.1002\/dta.3784","type":"journal-article","created":{"date-parts":[[2024,8,16]],"date-time":"2024-08-16T04:11:08Z","timestamp":1723781468000},"page":"834-841","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Interlaboratory comparison of phosphatidylethanol in dried blood spots using different sampling devices"],"prefix":"10.1002","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9210-2802","authenticated-orcid":false,"given":"Matthias","family":"Bantle","sequence":"first","affiliation":[{"name":"Institute of Forensic Medicine, Forensic Toxicology and Chemistry University of Bern  Bern Switzerland"},{"name":"Department of Chemistry, Biochemistry and Pharmaceutical Sciences University of Bern  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9270-0535","authenticated-orcid":false,"given":"Frederike","family":"St\u00f6th","sequence":"additional","affiliation":[{"name":"Institute of Forensic Medicine, Forensic Toxicology and Chemistry University of Bern  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8659-1304","authenticated-orcid":false,"given":"Wolfgang","family":"Weinmann","sequence":"additional","affiliation":[{"name":"Institute of Forensic Medicine, Forensic Toxicology and Chemistry University of Bern  Bern Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3111-0750","authenticated-orcid":false,"given":"Marc","family":"Luginb\u00fchl","sequence":"additional","affiliation":[{"name":"Institute for Clinical Chemistry University Hospital and University Zurich  Z\u00fcrich Switzerland"},{"name":"PEth\u2010NET, Society of Phosphatidylethanol Research  Basel Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2024,8,16]]},"reference":[{"key":"e_1_2_8_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/wfs2.1456"},{"key":"e_1_2_8_3_1","doi-asserted-by":"publisher","DOI":"10.1093\/alcalc\/agad010"},{"key":"e_1_2_8_4_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.forsciint.2017.12.030"},{"key":"e_1_2_8_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/tri.12949"},{"key":"e_1_2_8_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/dta.2570"},{"key":"e_1_2_8_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00414\u2010016\u20101394\u20104"},{"key":"e_1_2_8_8_1","doi-asserted-by":"publisher","DOI":"10.1002\/dta.3340"},{"key":"e_1_2_8_9_1","doi-asserted-by":"publisher","DOI":"10.1002\/dta.3559"},{"key":"e_1_2_8_10_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00216\u2010011\u20105221\u2010y"},{"key":"e_1_2_8_11_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00414\u2010012\u20100799\u2010y"},{"key":"e_1_2_8_12_1","doi-asserted-by":"publisher","DOI":"10.1093\/alcalc\/agv120"},{"key":"e_1_2_8_13_1","doi-asserted-by":"publisher","DOI":"10.1002\/dta.2567"},{"key":"e_1_2_8_14_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00216\u2010015\u20109169\u20101"},{"key":"e_1_2_8_15_1","doi-asserted-by":"publisher","DOI":"10.1002\/dta.3537"},{"key":"e_1_2_8_16_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.talanta.2020.121694"},{"key":"e_1_2_8_17_1","doi-asserted-by":"publisher","DOI":"10.1080\/00365513.2023.2253734"},{"key":"e_1_2_8_18_1","doi-asserted-by":"publisher","DOI":"10.3390\/metabo13101038"},{"key":"e_1_2_8_19_1","doi-asserted-by":"publisher","DOI":"10.1093\/jat\/bkaa034"},{"key":"e_1_2_8_20_1","unstructured":"Herbold M SchmittG andSkoppG.Auswertung von Ringversuchsdaten: Horwitz vs. DIN ISO 13528.Toxichem Krimtech 2013.80p.371ff."},{"key":"e_1_2_8_21_1","doi-asserted-by":"publisher","DOI":"10.1093\/jat\/bkad009"},{"key":"e_1_2_8_22_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.alcohol.2021.04.002"},{"key":"e_1_2_8_23_1","doi-asserted-by":"publisher","DOI":"10.1021\/ac5022562"},{"key":"e_1_2_8_24_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00216\u2010021\u201003211\u2010z"},{"key":"e_1_2_8_25_1","volume-title":"Handbuch Validierung in der Analytik","author":"Kromidas S","year":"2011"},{"key":"e_1_2_8_26_1","doi-asserted-by":"publisher","DOI":"10.1093\/jaoac\/89.4.1095"},{"key":"e_1_2_8_27_1","doi-asserted-by":"publisher","DOI":"10.1093\/jaoac\/81.6.1257"},{"key":"e_1_2_8_28_1","doi-asserted-by":"publisher","DOI":"10.1351\/pac199365092123"},{"key":"e_1_2_8_29_1","unstructured":"EMA ICH M10 on bioanalytical method validation\u2014scientific guideline. 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