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Blood alcohol content (BAC), also called blood alcohol concentration or blood alcohol level, is a measurement of alcohol intoxication used for legal or medical purposes. [1] BAC is expressed as mass of alcohol per volume of blood. In US and many international publications, BAC levels are written as a percentage such as 0.08%, i.e. there is 0.8 ...
Symptoms of varying BAC levels. Additional symptoms may occur. The short-term effects of alcohol consumption range from a decrease in anxiety and motor skills and euphoria at lower doses to intoxication (drunkenness), to stupor, unconsciousness, anterograde amnesia (memory "blackouts"), and central nervous system depression at higher doses.
Some effects of alcohol intoxication, such as euphoria and lowered social inhibition, are central to alcohol's desirability. [21] As drinking increases, people become sleepy or fall into a stupor. At very high blood alcohol concentrations, for example above 0.3%, the respiratory system becomes depressed and the person may stop breathing. [22]
In contrast, only 16 percent of those involved in fatal wrecks have BAC levels under 0.08 (and the number is even lower for those specifically in the .05 to .07 range who would presumably be ...
NHTSA reports that the following blood alcohol levels (BAC) in a driver will have the following predictable effects on his or her ability to drive safely: (1) A BAC of .02 will result in a "[d]ecline in visual functions (rapid tracking of a moving target), a decline in the ability to perform two tasks at the same time (divided attention)"; (2 ...
Drunk driving is the act of operating a motor vehicle with the operator's ability to do so impaired as a result of alcohol consumption, or with a blood alcohol level in excess of the legal limit. [1] For drivers 21 years or older, driving with a blood alcohol concentration (BAC) of 0.08% or higher is illegal.
In jurisdictions in the U.S., maximum blood alcohol levels for legal driving are about 17 to 22 mM. [ 67 ] [ 68 ] In the upper range of recreational ethanol concentrations of 20 to 50 mM, depression of the central nervous system is more marked, with effects including complete drunkenness, profound sedation, amnesia, emesis, hypnosis, and ...
Levels of even less than 0.1% can cause intoxication, with unconsciousness often occurring at 0.3–0.4%. [233] Death from ethanol consumption is possible when blood alcohol levels reach 0.4%. A blood level of 0.5% or more is commonly fatal. The oral median lethal dose (LD 50) of ethanol in rats is 5,628 mg/kg. Directly translated to human ...