How Long Does Methadone Stay in Blood?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: Most people clear Methadone from blood within ~2–3 days of last use — heavy or daily use stretches that window substantially. Expanded urine: 300 ng/mL initial; EDDP (metabolite) confirm ~250 ng/mL.
Methadone detection windows by test type
Each specimen tells a different story because each samples different biology:
| 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 |
('Blood testing measures ACTIVE circulation — closest proxy to impairment, shortest windows (hours-to-a-couple-days). Hospitals order it clinically; courts order it post-accident (DUI contexts); employers rarely bother given logistics and cost.',)
Why detection works this way
Methadone maintenance patients show steady-state levels constantly — clinic programs EXPECT positivity and monitor take-home compliance via EDDP ratios.
Employment 10/12-panel cups include MTD; a documented opioid-treatment-program prescription verifies through the MRO and is protected in many jurisdictions.
Its long, variable half-life (8–59 hours) makes personal prediction unreliable; clinic supervision governs dosing.
Testing cutoffs in plain language
Expanded urine: 300 ng/mL initial; EDDP (metabolite) confirm ~250 ng/mL. A specimen under the initial cutoff reports negative without further work; a screen above cutoff gets confirmed by mass spectrometry before anyone sees a positive.
Planning ahead? Our at-home drug test guide covers retail kits that mirror lab screens.
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Does Methadone Show up on a Drug Test?
No — Methadone is absent from standard drug panels. Full guide →
How Long Does Methadone Show up in a Drug Test?
How long Methadone stays detectable in your system (all test types) — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
How to Pass a Drug Test for Methadone?
Evidence-based ways to pass a drug test for Methadone — realistic timelines, what works, what backfires, and dilution flags to avoid. Full guide →
How Long Does Methadone Stay in Saliva Drug Test?
How long Methadone stays detectable in saliva (mouth swab) — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
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)