What is EtG? Ethyl Glucuronide is a direct metabolite of ethanol produced by the liver. Unlike standard BAC tests, EtG urine tests can detect alcohol use for up to 80 hours (3–4 days) after drinking — even after BAC returns to zero. It is widely used in DUI monitoring, probation, workplace programs, and liver transplant evaluations.

Personal Details

Body Weight (lbs)

Biological Sex Affects alcohol metabolism rate

Age (years) Older individuals may metabolize slower

Drinking Details

Total Standard Drinks 1 standard drink = 12 oz beer (5%), 5 oz wine (12%), or 1.5 oz spirit (40%)

Duration of Drinking (hours) How long the drinking session lasted

Hours Since Last Drink

Hydration Level Higher water intake dilutes urine and may shorten detection slightly

Test Threshold

500 ng/mL Standard cutoff — most common for workplace, probation, and DUI monitoring 100 ng/mL Low-level (EtG-I) — used in strict monitoring programs, liver transplant evaluations Show Both Compare 500 ng/mL and 100 ng/mL results side by side

EtG Detection Estimate

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Time elapsed since last drink Remaining detection window

Estimated EtG Detection Window

Hours After Last Drink	Est. EtG Level	500 ng/mL Test	100 ng/mL Test

* Detection windows are estimates derived from published pharmacokinetic research (Wurst et al., 2003; Janda et al., 2002; SAMHSA EtG guidelines). Actual results depend on individual metabolism, kidney function, hydration, body composition, and laboratory sensitivity. This tool does not constitute medical or legal advice.

📋 Key EtG Facts

Detection Window EtG can remain detectable for 24–80 hours after drinking, depending on quantity consumed and individual factors.

Standard Cutoff (500 ng/mL) Most courts, employers, and probation programs use this threshold. A positive result indicates consumption in the past 1–3 days.

Low-Level Cutoff (100 ng/mL) Used in strict monitoring. Can be triggered by incidental exposure (mouthwash, hand sanitizer, certain foods). Many labs add an EtS test to confirm.

Incidental Exposure Risk Alcohol-based mouthwash, hand sanitizer, kombucha, and some ripe fruits may produce low positive results at the 100 ng/mL level.

Hydration Effect Drinking large amounts of water dilutes urine and may lower EtG concentration, but does not accelerate elimination of EtG itself.

Hair & Blood EtG EtG can also be measured in hair (up to 90 days of history) and blood (shorter window). This calculator covers urine testing only.

EtG Calculator

EtG Detection Estimate

Estimated EtG Detection Window

📋 Key EtG Facts