{"id":"peth-16-0-18-1","name":"PEth 16:0/18:1 (Phosphatidylethanol)","shortName":"PEth 16:0/18:1","aliases":["PEth 16:0/18:1","POPEth","Phosphatidylethanol 16:0/18:1","PEth 16:0/18:1 (POPEth)","PEth 16:0/18:1 (POPEth) by LC-MS/MS"],"abbreviations":["POPEth"],"loinc":[{"code":"97607-6","primary":true},{"code":"74661-0","primary":false}],"specimen":"whole-blood","units":[{"ucum":"ng/mL","display":"ng/mL"},{"ucum":"umol/L","display":"µmol/L"}],"referenceRanges":[{"population":"Adults","low":null,"high":20,"unit":"ng/mL","unitDisplay":"ng/mL","note":"Usual cutoff for abstinence or low alcohol intake: below 20 ng/mL (about 0.03 µmol/L), the 2022 Consensus of Basel level that most US commercial labs also use to call a result positive. Mayo Clinic Laboratories uses a lower cutoff and reports negative only below 10 ng/mL. ARUP Laboratories tells you to refer to the report. Cutoffs and wording vary by lab, and Sweden uses a higher 35 ng/mL.","sources":[{"title":"Consensus for the use of the alcohol biomarker phosphatidylethanol (PEth) for the assessment of abstinence and alcohol consumption in clinical and forensic practice (2022 Consensus of Basel)","url":"https://doi.org/10.1002/dta.3340","publisher":"Drug Testing and Analysis","year":2022},{"title":"Assessing alcohol consumption in an era of direct alcohol markers","url":"https://pmc.ncbi.nlm.nih.gov/articles/PMC13471211/","publisher":"JHEP Reports","year":2026},{"title":"Phosphatidylethanol Confirmation, Blood (test PETH)","url":"https://www.testcatalog.org/show/PETH","publisher":"Mayo Clinic Laboratories (via the testcatalog.org mirror)"}]}],"review":{"status":"ai-verified","label":"AI-verified against cited sources. Awaiting expert review","lastReviewed":"2026-10-03"},"summary":"A blood marker that forms only when alcohol is in your blood, showing alcohol use over roughly the past two to four weeks.","url":"https://bloodtesttracker.com/markers/peth-16-0-18-1","notice":"Information, not medical advice. Ranges differ between labs, so the range on your own report is the one your result is judged against."}