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I updated my table of medications and other drugs that can make urine drug screen false-positives, including adding a column for fentanyl:

mdaware.blogspot.comUrine Drug Screen False PositivesUpdate 12/31/2025: I found and added a bunch more, including a column for false positives for fentanyl assays and more for LSD and a bunch o...

Seth Trueger

@mdaware.org

31 Dec 2025

friendly reminder that urine drug screens are bad tests, they miss a lot of things and a lot of common/benign medications can trigger false positives it's basically an EM boards question to NOT make clinical decisions based on UDS

mdaware.blogspot.comUrine Drug Screen False PositivesUpdate 12/31/2025: I found and added a bunch more, including a column for false positives for fentanyl assays and more for LSD and a bunch o...

Seth Trueger

@mdaware.org

also of course posts ≠ medical advice "can make positive" ≠ "makes positive" and so forth

31/12/25, 10:21 pm0 reposts18 likes

Steven Ilko 🏥 🚁💨

@zentensivistilko.bsky.social

31 Dec 2025

my favorite order to see anywhere I work is "UDS w/ confirm"