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Pericardial fluid (PF), muscle and vitreous humor (VH) have been suggested as alternatives to blood, but only a few studies have investigated the detection of opioids in these matrices. In this study, we aimed to investigate the detection of methadone, buprenorphine, oxycodone, fentanyl and tramadol in postmortem samples of PF, skeletal muscle and VH, in addition to PB and cardiac blood and if drug concentrations in these alternative matrices were comparable to those in PB and thereby useful for interpretation. In most of the 54 included cases, only one opioid was detected. Methadone, oxycodone, fentanyl and tramadol were detected in all of the alternative matrices in almost all cases, while buprenorphine was detected less often. For methadone, the concentrations in the alternative matrices, except in VH, were relatively similar to those in PB. Larger variations in concentrations were found for buprenorphine, oxycodone and tramadol. Quantitative analyses appeared useful for fentanyl, in all of the alternative matrices, but only four cases were included. Toxicological analyses of opioids in these alternative postmortem matrices can be useful for detection, but quantitative results must be interpreted with caution.<\/jats:p>","DOI":"10.1093\/jat\/bkab071","type":"journal-article","created":{"date-parts":[[2021,6,11]],"date-time":"2021-06-11T18:58:18Z","timestamp":1623437898000},"page":"600-610","source":"Crossref","is-referenced-by-count":14,"title":["Methadone, Buprenorphine, Oxycodone, Fentanyl and Tramadol in Multiple Postmortem Matrices"],"prefix":"10.1093","volume":"46","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6229-2246","authenticated-orcid":false,"given":"Stine Marie","family":"Havig","sequence":"first","affiliation":[{"name":"Department of Forensic Sciences, Oslo University Hospital , Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vigdis","family":"Vindenes","sequence":"additional","affiliation":[{"name":"Department of Forensic Sciences, Oslo University Hospital , Oslo, 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