blood alcohol concentration test (BAC) is a test that measures the amount of alcohol (ethanol) in the body and can be performed even if the person has only been drinking for a few minutes. Both legally and medically, the significance of a blood alcohol concentration test is to determine whether the person being tested is intoxicated and to apply some behavioral control measures if necessary.

Blood alcohol concentration test is used to measure ethanol concentration, mainly used in the case of alcohol concentration testing of drivers participating in traffic or patients undergoing alcohol abstinence treatment.