Blood alcohol content (or blood alcohol concentration), often abbreviated BAC, is the concentration of alcohol in blood, measured, by volume, as a percentage.
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For example, a BAC rating of 0.20 means 1 part per 500 in an individual's blood is alcohol.
In many countries, the BAC is measured and reported as milligrams of alcohol per 100 milliliters of blood (mg/100ml).
Number of drinks consumed is a poor measure of intoxication..
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