What Does BUP Mean on a Drug Test? (Buprenorphine)?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: BUP is the laboratory abbreviation for Buprenorphine. BUP catches buprenorphine/buprenorphine at ultra-low ~5 ng/mL — addiction-program staple, newer to employment cups.
Reading your cup or lab report
Multi-panel cups print 2–4 letter codes beside each strip line. One line per drug class; a visible control line plus absent drug line = negative for that class. Faint lines still count as present (they're competitive-inhibition assays) — the classic misread.
Related codes on the same cup
Cups group codes logically: AMP/mAMP (stimulants), OPI/MOP/OXY/BUP (opioid family), BZO/BAR (depressants), COC/THC/PCP (classics), plus validity markers like creatinine printed on lab reports rather than cups.
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Do prescriptions count against me?
No — verified prescriptions report as negative through the Medical Review Officer. Declare medications at collection and answer the follow-up call.
Sources & further reading
- SAMHSA — Mandatory Guidelines for Federal Workplace Drug Testing Programs (cutoffs, MRO process)
- DOT — 49 CFR Part 40 procedures for transportation workplace testing
- Brahm NC et al., Mayo Clinic Proceedings 2008;83(1):66–76 — false-positive cross-reactivity reference
- FDA — drug-of-abuse test device labeling (detection window conventions)