What Does MTD Mean on a Drug Test? (Methadone)?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: MTD is the laboratory abbreviation for Methadone. MTD monitors clinic methadone (~300 ng/mL). Quetiapine and diphenhydramine can false-flag the screen tier.
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.
About Methadone
Expanded urine: 300 ng/mL initial; EDDP (metabolite) confirm ~250 ng/mL.
Methadone maintenance patients show steady-state levels constantly — clinic programs EXPECT positivity and monitor take-home compliance via EDDP ratios.
Detection windows
| Test type | Typical Methadone detection window |
|---|---|
| Urine | single: 2–4 days; maintenance: up to 2 weeks+ (EDDP persists) |
| Saliva (Mouth Swab) | any: 1–3 days |
| Hair Follicles | up to 90 days |
| Blood | any: ~2–3 days |
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)