What does Blood Alcohol Concentration (BAC) measure?

Blood Alcohol Concentration (BAC) is a measure that quantifies the amount of alcohol contained in a person's bloodstream. It is expressed as a percentage, indicating the grams of alcohol per deciliter of blood. This measurement is crucial for assessing a person's level of intoxication and their ability to operate vehicles or machinery safely. Understanding BAC is vital in various contexts, such as legal regulations, health monitoring, and education regarding alcohol consumption effects on the body.

The other options refer to different aspects of alcohol and its effects. For instance, while urine tests can reflect alcohol consumption, they do not directly measure blood alcohol levels like BAC does. Breath analysis can estimate BAC based on exhaled air, but it does not measure the alcohol present in the blood directly. Finally, the metabolic rate of alcohol in the liver pertains to how quickly the body processes alcohol, which is a different concept than measuring BAC.