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Office of Alcohol, Drug, and Health Education

Blood Alcohol Concentration

Definition - Blood alcohol concentration (or blood alcohol level) refers to the ratio of alcohol to blood in the bloodstream. It also accurately reflects the level of alcohol in the body and is represented as a percentage. Alcohol's presence can be measured by a blood, breath, or urine test. Many charts are available (see links below) which indicate the estimated BAC for various size and weight, but please be aware that these are only approximations. Results can vary for a number of reasons.
Also, please realize that the percentage usually cited as the legal limit of .10% is not an indication of drunkenness or sobriety. Too often, people believe that a BAC below .10% is equivalent to being sober, but that is not the case. For those under the age of 21, a BAC of .02% is sufficient for arrest and conviction for DUI.

Physical and Emotional Effects at Various Blood Alcohol Levels
The following are descriptions of typical behavioral changes which occur at various blood alcohol concentrations. Reactions will vary among individuals.

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