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Traditional urine alcohol tests detect ethanol directly and have a window of just 12–48 hours. However, EtG (ethyl glucuronide) urine tests are far more sensitive, detecting alcohol consumption for 48–80 hours after the last drink. EtG tests are now standard in probation programs, court-ordered monitoring, professional licensing boards (medical, legal, aviation), and some workplace programs.
EtG is a direct metabolite of ethanol produced by UDP-glucuronosyltransferase in the liver. Unlike ethanol itself, EtG is non-volatile and accumulates in urine as a stable biomarker. The typical cutoff for EtG screening is 500 ng/mL for establishing recent heavy drinking or 100–200 ng/mL for abstinence monitoring programs. The lower cutoff can detect even a single drink consumed 2–3 days prior.
Incidental exposure is a legitimate concern with sensitive EtG testing. Hand sanitizer (60–95% ethanol), mouthwash (Listerine contains 21.6% alcohol), certain foods (ripe fruit, vinegar, kombucha), and over-the-counter medications (NyQuil contains 10% alcohol) can produce low-level positive EtG results at the 100 ng/mL cutoff. This is why the 500 ng/mL cutoff is preferred for establishing intentional drinking.
The 80-hour detection claim for EtG comes from heavy drinking scenarios (5+ standard drinks). Moderate drinking (2–3 drinks) typically produces detectable EtG for 36–48 hours. A single drink may be detectable for 24–36 hours at the 100 ng/mL cutoff. These windows assume normal kidney function and hydration — dehydration concentrates the sample and can extend apparent detection.
This tool is most useful for tracking trends rather than obsessing over a single data point. Run the calculation monthly with consistent measurement conditions to see whether your metric is moving in the right direction.
The most common mistake is treating the result as a precise measurement rather than an evidence-based estimate. All body metric calculators have margins of error — use the result as a tracking baseline, not a clinical diagnosis.
A personal trainer uses the calculator with a new client to set a measurable starting point. Re-running the calculation at 4-week intervals provides an objective progress metric that supports motivation and programme adjustments.
At the 100 ng/mL cutoff, heavy hand sanitizer use can potentially produce low-level positives. At the 500 ng/mL cutoff, this is extremely unlikely. The 500 ng/mL threshold is designed to avoid incidental exposure false positives.
Very sensitive. At 100 ng/mL, even a single drink can be detected 24–36 hours later. At 500 ng/mL, 3+ drinks can be detected for 48–60 hours. This makes EtG the most sensitive alcohol biomarker available.
Yes. NyQuil contains 10% alcohol. A standard dose contains enough ethanol to produce a positive EtG result at the 100 ng/mL cutoff for 24+ hours. Alcohol-free formulations are available.
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