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Ethanol, drinking alcohol, disappears in the mouth, the stomach and the small intestine and enters the blood.

BACGraph2004Horiz.jpg (205995 bytes)Graph of blood alcohol concentration over time as a 155 lb. male consumes 4 341 ml. beers with a full stomach. Food has slowed this absorption down. Without food the absorption would be quicker.

Notice the time 1900 to 2200. At first there is absorption of alcohol through the mouth, stomach, and intestines and into the blood. Almost immediately elimination begins as the liver starts to metabolize the alcohol. The blood alcohol concentration rises during this absorptrion phase because absorption greatly exceeds elimination.

After that there is a plateau where the BAC stays fairly constant or bounces up and down a bit. Plateau absorption rate equals elimination rate approximately but stomach flap sometimes opens to let contents into intestine. Some people may plateau for 2 hours.

The elimination phase starts about 2300. elimination would have continued through 0100 and beyond at a rate of about 10 to 20 mg/100mls per hour. Back calculations work ONLY in the elimination phase, if at all.

Don't use this information to calculate your own BAC, that could be dangerous. The BAC equivalent of each bottle of beer varies from individual to individual and varies with weight, gender, and body shape.  



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See also: elimination

See also: absorption

See also: employee education

See also: As Soon as Practicable

See also: acetone

See also: acetone

See also: last drink defence

See also: bolus drinking

See also: rising alcohol

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DUI Law: Words, Concepts, Issues, Terminology, and Ideas

DUI Law: absorption Information For Expression and Peer Review by Law Students, Articled Clerks, and Students-at-Law

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This DUI Law absorption page is for expression by students of law and forensic science in understanding and peer reviewing important DUI Law: absorption concepts, words, issues, and ideas. This site is not intended to provide DUI legal advice to the public. Members of the public with DUI law questions should consult and retain a DUI lawyer or attorney for proper legal advice. Because this absorption information comes from many sources who may not be DUI law lawyers or attorneys and because this site does NOT contain solicitor-to-client personalized advice it would be unsafe to rely upon this absorption information. This database was developed by Stephen R. Biss, Barrister & Solicitor, who practices law in Mississauga, Ontario, Canada.


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For more information respecting this database or to report misuse contact: Allbiss Lawdata Ltd., 303-470 Hensall Circle, Mississauga, Ontario, Canada, L5A 3V4. The author and the participants make no representation or warranty  whatsoever as to the authenticity and reliability of the information contained herein. Advertisement. The participants do not practice in association. WARNING: All information contained herein is provided by students of the law for the purpose of discussion and peer review only and should not be construed as formal legal advice. The authors disclaim any and all liability resulting from reliance upon such information. You are strongly encouraged to seek professional legal advice before relying upon any of the information contained herein. Legal advice should be sought directly from a properly retained lawyer or attorney.

Intoxilyzer®  is a registered trademark of CMI, Inc. The Intoxilyzer® 5000C is an "approved instrument" in Canada.
Breathalyzer® is a registered trademark of Draeger Safety, Inc., Breathalyzer Division. The owner of the trademark is Robert F. Borkenstein and Draeger Safety, Inc. has leased the exclusive rights of use from him. The Breathalyzer® 900 and Breathalyzer® 900A are "approved instruments" in Canada.
Alcotest® is a registered trademark of Draeger Safety, Inc. The Alcotest® 7410 GLC is an "approved screening device" in Canada.
Datamaster®  is a registered trademark of National Patent Analytical Systems, Inc.  The BAC Datamaster® C  is an "approved instrument" in Canada.


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