Detection windows · alcohol
Alcohol (ethanol) detection windows
Workplace alcohol testing is typically a breath test (BrAC) under DOT and most non-DOT programs. EtG and EtS are conjugated metabolites measurable in urine for longer windows and are commonly used in abstinence-monitoring contexts.
Last updated:How long is Alcohol (ethanol) detectable?
Detection windows for Alcohol (ethanol) vary by specimen, use pattern, and individual factors. As approximate ranges: urine commonly covers a few days (longer in chronic users), oral fluid covers hours to about 48 hours, blood covers hours, and hair offers up to ~90 days after a ~7–10 day incorporation delay. Full matrix below — and see the interactive Explorer for cross-substance comparisons.
| Specimen | Window | Pattern | Caveat |
|---|---|---|---|
| Breath | 1–24 hours | typical | BrAC clears at ~0.015–0.020 per hour; reflects very recent intake. |
| Urine | 12–80 hours | typical | EtG/EtS detect prior drinking; abstinence-monitoring tool. |
| Blood | 1–12 hours | typical | Ethanol clears with similar zero-order kinetics to BrAC. |
| Hair | 30–90 days | typical | EtG in hair used in some abstinence-monitoring contexts; not federally approved. |
Ranges are approximate and vary by individual physiology, hydration, dose, frequency of use, and lab cutoff. They are not predictive of whether someone will "pass" a test.
About Alcohol (ethanol)
Beverage alcohol (ethanol). Breath alcohol concentration (BrAC) approximates blood alcohol concentration (BAC). Conjugated metabolites EtG (ethyl glucuronide) and EtS (ethyl sulfate) extend detection beyond ethanol's short half-life.
Key analytes / metabolites detected
- Ethyl glucuronide (EtG)
- Ethyl sulfate (EtS)
- Acetaldehyde / acetate
Common cross-reactants (immunoassay-stage)
The following can affect screening immunoassay results and are typically resolved by mass-spectrometry confirmation and MRO review:
- Hand sanitizer / mouthwash (EtG, dose-dependent)
- Kombucha and fermented foods
Confirmation method
GC-MS or LC-MS/MS is the standard confirmation method for Alcohol (ethanol).
Sources & references
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