EtG is used as a marker or surrogate for ethanol in the body because of its much longer half-life compared to ethanol itself. ETG Alcohol Urine Test Dip Card (80 Hour Detection Window). The EtG Alcohol Urine Test kit dip card provides a fast, easy and accurate way to test for the detection of alcohol consumption for up to 80 hours, longer than any other instant result alcohol test on the market.