EtG Calculator: How Long Does EtG Stay in Urine?
Estimate whether an ethyl glucuronide (EtG) urine test could still detect your last drink, based on published laboratory interpretation guidance.
How Long Does EtG Stay in Urine?
Ethyl glucuronide is usually detectable in urine for about 1 to 3 days after drinking (Mayo Clinic Laboratories). After heavy drinking and with a low cutoff, it can show up for as long as 80 hours (Quest Diagnostics).
The window depends on three things: how much you drank, how long ago you stopped, and the cutoff your lab uses.
Detection Windows Used by This Calculator
| How much you drank | 100 ng/mL | 500 ng/mL | 1,000 ng/mL |
|---|---|---|---|
| Light (1–2 drinks) | up to ~36 h | up to ~24 h | same day (~12 h) |
| Heavy (3+ drinks) | up to ~80 h | up to ~72 h | up to ~48 h |
These windows come from the interpretation guidance in Mayo Clinic Laboratories' EtG test catalog. The 80-hour upper limit comes from Quest Diagnostics. Real results vary with body size, kidney function, how concentrated the sample is, and the exact drinking pattern.
What Your EtG Result Means
Labs report EtG in nanograms per milliliter (ng/mL). Mayo Clinic Laboratories describes the levels like this:
| EtG level | Category | What it usually suggests |
|---|---|---|
| Over 1,000 ng/mL | High positive | Heavy drinking the same day or in the previous 1–2 days, or light drinking the same day. |
| 500–1,000 ng/mL | Low positive | Heavy drinking in the previous 1–3 days, light drinking in the past 24 hours, or intense exposure to alcohol-containing products within about a day. |
| 100–500 ng/mL | Very low positive | Heavy drinking in the previous 1–3 days, light drinking 12–36 hours earlier, or recent exposure to alcohol-containing products. |
Cutoffs are not standardized across labs. Mayo screens at 500 ng/mL and confirms a positive with mass spectrometry when EtG is at least 250 ng/mL and/or EtS is at least 100 ng/mL. Criminal justice programs often prefer lower cutoffs such as 100 ng/mL, the strictest common one. If you don't know your program's cutoff, assume 100.
EtG vs. EtS: Why Labs Test Both
Ethyl sulfate (EtS) is a second minor breakdown product of alcohol. Both are formed only when ethanol is present, but they behave differently in the sample cup:
- EtG can form in the sample itself if the urine contains ethanol-producing bacteria.
- EtS has not been reported to form this way, so a positive EtS confirms that the alcohol exposure happened in the body. Quest, for example, does not report a positive EtG unless EtS is also at least 100 ng/mL.
- EtS has a shorter window and is detectable for about 24 hours or more (Quest).
Hand Sanitizer, Mouthwash and Other Incidental Exposure
EtG tests detect ethanol from any source. They can't tell a drink apart from alcohol absorbed through skin, breath or medicine. According to Mayo Clinic Laboratories, intense or recent exposure to alcohol-containing products can produce low or very low positives (roughly 100–1,000 ng/mL). Results above 1,000 ng/mL are considered unlikely to come from incidental exposure alone.
Common sources include alcohol-based hand sanitizer, mouthwash, some over-the-counter medicines, medicated patches with ethanol, and foods or drinks that can contain small amounts of alcohol, such as non-alcoholic beer or kombucha. Monitoring programs usually give participants a list of products to avoid. Follow that list, since a positive from a "hidden" source can still count against you.
Can You Flush EtG Out Faster?
- Drinking lots of water dilutes urine, but labs check creatinine and specific gravity. A sample with creatinine below 20 mg/dL is usually flagged as dilute, and many programs treat a dilute sample as a failed test.
- Exercise or sauna doesn't help: EtG leaves the body through the kidneys, not sweat.
- Detox drinks have no proven effect on EtG. Time without alcohol is the only thing that lowers it.
Where EtG Tests Are Used
Because EtG lasts far longer than alcohol itself, it is used to check abstinence in probation and court programs, professional health programs for doctors, nurses and pilots, addiction treatment, and liver transplant evaluation. In 2006 SAMHSA cautioned that EtG alone should not be the sole basis for legal or disciplinary action. Its 2012 advisory revisited that position as research grew (NDAA, 2012).
Need to show a longer period without alcohol? The PEth blood test covers roughly the past 2–4 weeks. For a single night out, the BAC calculator estimates when alcohol leaves your blood, which is hours rather than days.
Frequently Asked Questions
Can one beer show up on an EtG test?
Yes. After light drinking, EtG can be detected for up to about 36 hours at a 100 ng/mL cutoff and up to about 24 hours at 500 ng/mL.
Is the "80-hour test" real?
80 hours is the upper end, typically after heavy drinking and with a low cutoff. Most light drinking clears much sooner. But a heavy session can stay visible for three days or more.
How long does EtG stay in urine after heavy drinking?
Usually 1–3 days, and up to about 80 hours at a 100 ng/mL cutoff. Sample concentration, body size and kidney function all move the number.
Does EtG show how much I drank?
Not reliably. A single urine level depends on how diluted the sample is and when you last drank. That's why labs report ranges like "low positive" rather than a number of drinks.