Alcohol Use and Older Adults

Frequently Asked Questions

12. What is blood alcohol concentration?

Blood alcohol concentration (BAC) measures the percentage of ethanol -- the chemical name for alcohol -- in a person's blood. The higher the BAC, the more impaired a person is. The amount of alcohol consumed, gender, weight, and body fat all affect a person's BAC. In all states, it is against the law for people to drive if their BAC is above a specific level. A BAC below the legal limit can still impair driving skills.