Alcohol, medically termed ethanol, is an ingredient in alcoholic beverages like whiskey, vodka, beer and wine. Alcohol is absorbed into the blood shortly after consumption; hence, a blood alcohol test is conducted to determine the alcohol levels in the body. Although alcohol can stay in your system for days, it majorly depends on the quantity and concentration of alcohol consumed. Alcohol consumption in large amounts can cause several chemical changes in the brain, liver etc. Liver function test, gamma glutamyl transferase (GGT), carbohydrate-deficient transferrin (CDT) are some of the tests that are helpful in diagnosing the ill effects of overconsumption of alcohol.