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We present the retrospective identification of NPS in raw data from a liquid chromatography\u2010high resolution mass spectrometry (LC\u2010HRMS)\u2010based multidrug panel analysis on 14\u2009367 clinical oral fluid samples requested during 2019 mainly by psychiatric and addiction care clinics. Retrospectively analysed NPS included 48 notified originally in 2019 by the European Union Early Warning System (EU EWS) and 28 frequently reported in Sweden. Of 88 included NPS, 34 (mitragynine, flualprazolam, 3F\/4F\u2010\u03b1\u2010P(i)HP, etizolam, 4F\u2010MDMB\u2010BINACA, cyproheptadine, 5F\u2010MDMB\u2010PICA, isotonitazene, isohexedrone, MDPEP, N\u2010ethylpentedrone, tianeptine, flubromazolam, 4\u2032\u2010methylhexedrone, \u03b1\u2010P(i)HP, eutylone, mephedrone, N\u2010ethylhexedrone, 5F\u2010MDMB\u2010PINACA, ADB\u2010BUTINACA, 3\u2010methoxy PCP, 4F\u2010furanylfentanyl, 4F\u2010isobuturylfentanyl, acrylfentanyl, furanylfentanyl, clonazolam, norfludiazepam, 3F\u2010phenmetrazine, 3\u2010MMC, 4\u2010methylpentedrone, BMDP, ethylphenidate, methylone and \u03b1\u2010PVP) were identified as 219 findings in 84 patients. Eight NPS notified in 2019 were identified, five before EWS release. NPS occurred in 1.20% of all samples and 1.53% of samples containing traditional drugs, and in 1.87% of all patients and 2.88% of patients using traditional drugs. NPS use was more common in men and polydrug users. Legal (not scheduled) NPS were more used than comparable illegal ones. Retrospective identification could be useful when prioritizing NPS for clinical routine analysis and when studying NPS epidemiology.<\/jats:p>","DOI":"10.1111\/bcpt.13786","type":"journal-article","created":{"date-parts":[[2022,8,27]],"date-time":"2022-08-27T00:49:00Z","timestamp":1661561340000},"page":"420-434","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":34,"title":["Retrospective identification of new psychoactive substances in patient samples submitted for clinical drug analysis"],"prefix":"10.1111","volume":"131","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3299-3663","authenticated-orcid":false,"given":"Magnus A. 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