EtG Test Guide: Urine Alcohol Testing, Detection Times & Cutoffs
An EtG test can detect recent alcohol exposure long after a breathalyzer reads zero. The key is knowing what the test measures, which cutoff applies, and how much uncertainty remains.
Editorial note
This educational page is maintained by EtGCalc and reviewed against published EtG research, SAMHSA guidance, and our calculator methodology. It does not provide medical or legal advice.
Need a personal estimate?
This guide explains the test. The calculator estimates your own timeline using weight, sex, drinks, timing, and cutoff.
What Is an EtG Test?
An EtG test looks for ethyl glucuronide, a direct metabolite produced when your body processes ethanol. Because EtG remains in urine after alcohol itself is gone, it is often used for monitoring recent alcohol use.
People also call it an EtG urine test, urine alcohol test, EtG UA, or EtG drug screen. The names vary, but the core question is the same: is EtG above the lab's reporting cutoff?
EtG vs ethanol
Breath and blood alcohol tests measure current alcohol. EtG tests measure a metabolite, so they can extend the detection window into the next day or several days depending on dose and cutoff.
How EtG Urine Testing Works
1. Alcohol is metabolized
Your body breaks down ethanol. A small fraction is converted into EtG through glucuronidation.
2. EtG enters urine
EtG is water-soluble and is excreted through urine, where labs can measure it in ng/mL.
3. The cutoff decides
A sample above the cutoff is reported positive. A 100 ng/mL cutoff is stricter than 500 ng/mL.
EtG Detection Times by Drinking Level
Detection windows vary because EtG starts at different peak levels. These ranges are educational estimates, not guarantees.
| Scenario | Approx. amount | 500 ng/mL cutoff | 100 ng/mL cutoff |
|---|---|---|---|
| Light drinking | 1-2 standard drinks | 12-24 hours | 24-48 hours |
| Moderate drinking | 3-5 standard drinks | 24-36 hours | 36-60 hours |
| Heavy drinking | 6-8+ standard drinks | 36-72 hours | 60-80+ hours |
For a scenario-based estimate, compare these ranges with the EtG Detection Time Calculator.
100 ng/mL vs 500 ng/mL Cutoffs
100 ng/mL: stricter
More sensitive. Can detect lower residual levels, but also makes low positives and incidental exposure questions more important.
500 ng/mL: less sensitive
Often used to reduce low-level ambiguity. A person may be negative at 500 ng/mL while still positive at 100 ng/mL.
This is why generic answers fail. The same drinking event can produce different outcomes depending on the cutoff. See the full 100 ng/mL cutoff guide.
False Positives, Low Positives, and EtS Confirmation
EtG is sensitive, especially at lower cutoffs. Heavy use of ethanol-containing products such as mouthwash or hand sanitizer can sometimes create low-level findings. The interpretation depends on the number, the cutoff, the pattern, and the program's rules.
Some programs use EtS alongside EtG because EtS is another direct alcohol biomarker. Matching EtG and EtS results can strengthen interpretation; mismatched or very low values may require more context.
Read EtG vs EtS biomarker guideFrequently Asked Questions
What is an EtG test?
An EtG test looks for ethyl glucuronide, a direct alcohol metabolite. It is commonly used in urine testing because EtG can remain detectable after ethanol itself has already left the blood or breath.
Is an EtG test the same as a drug test?
EtG may appear on a drug testing panel, but it is specifically an alcohol metabolite test. A standard 5-panel drug test usually does not include EtG unless alcohol monitoring is ordered separately.
How long can an EtG urine test detect alcohol?
Many real-world urine EtG tests detect alcohol for about 24 to 72 hours, depending on dose, body size, timing, and cutoff. The often-quoted 80-hour window is usually an upper-end scenario after heavier drinking and sensitive cutoffs.
What does EtG stand for on a drug test?
EtG stands for ethyl glucuronide. It is formed when the body metabolizes ethanol and conjugates it with glucuronic acid.
Can an EtG test be positive from hand sanitizer or mouthwash?
Incidental exposure can sometimes create low-level EtG findings, especially near 100 ng/mL. Confirmation with EtS, cutoff context, and program rules matter when interpreting low positives.
What to Do Next
Related Reading
Medical & Legal Disclaimer
Not Medical Advice
EtGCalc does not provide diagnosis, treatment, or medical advice. Talk with a qualified healthcare provider about alcohol use, metabolism, testing concerns, or recovery.
Not Legal Advice
EtG testing can affect probation, custody, licensing, and employment decisions. Consult a licensed attorney or your testing program for legal questions.
If You Need Support
In the United States, SAMHSA's National Helpline is 1-800-662-4357. It is free, confidential, and available 24/7.
Calculator output is an estimate, not a test prediction. Individual metabolism, hydration, kidney function, genetics, specimen handling, and lab cutoff policy can change real results. See our methodology and sources.
References
- 1SAMHSA. The Role of Biomarkers in the Treatment of Alcohol Use Disorders, 2012 Revision.
Used for biomarker context, cutoff interpretation, and incidental exposure cautions.
- 2Jatlow et al. Ethyl glucuronide and ethyl sulfate assays in clinical trials, 2014.
Used for urinary EtG and EtS kinetics after alcohol exposure.
- 3McDonell et al. Using ethyl glucuronide in urine to detect alcohol use, 2015.
Used for EtG detection window context in clinical monitoring populations.