How Long Does Opiates Stay in Blood?
Evidence-based answer reviewed against SAMHSA cutoffs and FDA assay documentation · Updated August 2026
Quick answer: Most people clear Opiates from blood within ~12–24 hours of last use — heavy or daily use stretches that window substantially. Urine: 2,000 ng/mL morphine/codeine initial; 2,000 confirm. Heroin's unique marker 6-MAM confirms at 10 ng/mL.
Opiates detection windows by test type
Each specimen tells a different story because each samples different biology:
| Test type | Typical Opiates detection window |
|---|---|
| Urine | heavy: up to 4 days chronic |
| Saliva (Mouth Swab) | any: 1–2 days |
| Hair Follicles | up to 90 days |
| Blood | any: ~12–24 hours |
('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
The federal opiate panel targets morphine and codeine at a deliberately high 2,000 ng/mL cutoff — set precisely so poppy-seed breakfasts don't trigger careers-ending positives — plus heroin-specific 6-MAM confirmation.
Heroin metabolizes within minutes to 6-MAM then morphine; finding 6-MAM proves heroin specifically, since poppy seeds never contain it.
'Lean'/purple drank relies on codeine syrup: standard opiate detection applies (1–3 days urine).
Testing cutoffs in plain language
Urine: 2,000 ng/mL morphine/codeine initial; 2,000 confirm. Heroin's unique marker 6-MAM confirms at 10 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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How Long Do Opiates Stay in Urine?
How long Opiates stays detectable in urine — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
How Long Do Opiates Stay in Your System?
How long Opiates stays detectable in your system (all test types) — urine, hair, saliva & blood windows explained with cutoffs. Full guide →
Does Tramadol Show up As Opiate in Drug Test?
Yes — Opiates appears on standard drug panels. Full guide →
How Can I Pass a Drug Test for Opiates?
Evidence-based ways to pass a drug test for Opiates — realistic timelines, what works, what backfires, and dilution flags to avoid. Full guide →
How Long Does Opiates Stay in Blood?
Urine detection runs roughly ~1–2 days (6-MAM vanishes within ~8–22 hours; total morphine window 1–3 days) after last use; hair extends to ~90 days and saliva stays within 24–72 hours. Full breakdown in our detection guides.
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.
Related guides
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)