What Is an ETG Alcohol Test?
ETG (Ethyl Glucuronide) is a direct alcohol metabolite detectable in urine for up to 80 hours after the last drink.
How It Works
- ETG is formed when the liver processes alcohol
- Remains in urine long after alcohol itself is gone
- Much longer detection than breathalyzer or blood alcohol
Detection Windows
- Light drinking: 24–48 hours
- Moderate: 48–72 hours
- Heavy: up to 80 hours
Who Uses ETG?
- Court-ordered sobriety monitoring
- Substance abuse treatment programs
- Professional licensing boards
- Liver transplant evaluation
Limitations
- Can detect incidental alcohol exposure (hand sanitizer, mouthwash)
- Cutoff levels help distinguish drinking from incidental exposure
Source: SAMHSA, NIDA, Mayo Clinic.
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