In urine alcohol tests, how much alcohol (bac) does it take to come out positive?

No connection. Ethyl glucuronide (etg) is a direct metabolite of beverage alcohol (ethanol). Its presence in urine may be used to detect recent alcohol consumption, even after ethanol is no longer measurable. The presence of etg in urine is a definitive indicator that alcohol was ingested. Key benefits of using etg test include: detects recent usage more accurately and for a longer period of time than st.