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Blood alcohol content (BAC), also called blood alcohol concentration or blood alcohol level, is a measurement of
alcohol intoxication Alcohol intoxication, also known as alcohol poisoning, commonly described as drunkenness or inebriation, is the negative behavior and physical effects caused by a recent consumption of alcohol. In addition to the toxicity of ethanol, the main p ...
used for legal or medical purposes; it is expressed as mass of alcohol per volume or mass of blood. For example, a BAC of 0.10 by (0.10% or one tenth of one percent) means that there is 0.10 g of alcohol for every 100 mL of blood, which is the same as 21.7 mmol/L. A BAC of 0.10 by (0.10%) is 0.10 g of alcohol per 100 g of blood (23 mmol/L). A BAC of 0.0 is sober; in different countries the maximum permitted BAC when driving ranges from about 0.04% to 0.08%; BAC levels over 0.08% are considered very impaired; above 0.4% is potentially fatal.


Effects by alcohol level


Estimation by intake

Blood alcohol content can be estimated by a method developed by Swedish professor in the 1920s: :EBAC = \frac\times100\%-\beta\times T where: * is the mass of alcohol consumed. * is the ratio of body water to total weight. It varies between individuals but averages about 0.68 for men and 0.55 for women, since women tend to have a higher percentage of fat. * is body weight. * is the rate at which alcohol is metabolized. It is approximately 0.017% per hour. * is the amount time during which alcohol was present in the blood (usually time since consumption began). Sometimes the above is multiplied by 1.055 g/mL, the density of blood. In terms of
fluid ounce A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms ℥, fl ℥, f℥, ƒ ℥) is a unit of volume (also called ''capacity'') typically used for measuring liquids. The British Imperial, the United States customary, and the United S ...
s of alcohol consumed and weight in pounds, the formula can be written as :EBAC=8\times\text/\text-\beta\times T for a man or :EBAC=10\times\text/\text-\beta\times T for a woman. Regarding metabolism () in the formula; females demonstrated a higher average rate of elimination (mean, 0.017; range, 0.014–0.021 g/210 L) than males (mean, 0.015; range, 0.013–0.017 g/210 L). Female subjects on average had a higher percentage of body fat (mean, 26.0; range, 16.7–36.8%) than males (mean, 18.0; range, 10.2–25.3%). Additionally, men are, on average, heavier than women but it is not strictly accurate to say that the water content of a person alone is responsible for the dissolution of alcohol within the body, because alcohol does dissolve in fatty tissue as well. When it does, a certain amount of alcohol is temporarily taken out of the blood and briefly stored in the fat. For this reason, most calculations of alcohol to body mass simply use the weight of the individual, and not specifically their water content. Examples: * 80 kg male drinking 2 drinks of 14 grams (0.014 kg) each, in two hours: : EBAC = (2 \times 0.014)/(0.68 \cdot 80) \times 100\% - (0.015 \cdot 2) \approx 0.021\% * 70 kg woman drinking 1.5 drinks of 14 grams each, in two hours: : EBAC = (1.5 \times 0.014)/(0.55 \cdot 70) \times 100\% - (0.017 \cdot 2) \approx 0.021 \%


By standard drinks

The examples above define a standard drink as 0.6
fluid ounces A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms ℥, fl ℥, f℥, ƒ ℥) is a unit of volume (also called ''capacity'') typically used for measuring liquids. The British Imperial, the United States customary, and the United ...
(14 g or 17.7 mL) of ethanol, whereas other definitions exist, for example 10 grams of ethanol.


Binge drinking

The
National Institute on Alcohol Abuse and Alcoholism The National Institute on Alcohol Abuse and Alcoholism (NIAAA), as part of the U.S. National Institutes of Health, supports and conducts biomedical and behavioural research on the causes, consequences, treatment, and prevention of alcoholism and ...
(NIAAA) define the term "
binge drinking Binge drinking, or heavy episodic drinking, is drinking alcoholic beverages with an intention of becoming intoxicated by heavy consumption of alcohol over a short period of time, but definitions ( see below) vary considerably. Binge drinking i ...
" as a pattern of drinking that brings a person's blood alcohol concentration (BAC) to 0.08 grams percent or above. This typically happens when men consume five or more drinks, and when women consume four or more drinks, in about two hours."Quick Stats: Binge Drinking." The Centers for Disease Control and Prevention. April 200


Units of measurement

There are several different units in use around the world for defining blood alcohol concentration. Measures of mass (never volume) of alcohol per volume of blood or per mass of blood are used. 1 milliliter of blood has a mass of approximately 1.06 grams, so that units by volume are about 6% greater than if mass-based. The amount of alcohol on the breath can also be measured, without requiring drawing blood, by blowing into a
breathalyzer A breathalyzer or breathalyser (a portmanteau of ''breath'' and ''analyzer/analyser'') is a device for estimating blood alcohol content (BAC), or to detect viruses or diseases from a breath sample. The name is a genericized trademark of the Br ...
. The amount of alcohol measured on the breath is generally accepted as proportional to the amount of alcohol present in the blood, at a rate of 1:2100, so blood alcohol can be estimated from a breathalyzer reading. For example, a breathalyzer measurement of 0.10 mg/L of breath alcohol characterises 0.0001×2100 g/L, or 0.21 g/L of blood alcohol (equivalent to 0.21 permille). While a variety of units or criteria are used in different jurisdictions, many countries use the g/L unit, clearer than if expressed as a percentage. Usual units are listed below. For example, the U.S. uses a concentration unit of 1% w/v (percent mass/volume, equivalent to 10 g/L or 1 g per 100 mL).


Legal limits

For purposes of law enforcement, blood alcohol content is used to define intoxication and provides a rough measure of impairment. Although the degree of impairment may vary among individuals with the same blood alcohol content, it can be measured objectively and is therefore legally useful and difficult to contest in court. Most countries forbid operation of motor vehicles and heavy machinery above prescribed levels of blood alcohol content. Operation of boats and aircraft is also regulated. Some jurisdictions also regulate bicycling under the influence. The alcohol level at which a person is considered legally impaired to drive varies by country. The list below gives limits by country. These are typically blood alcohol content limits for the operation of a vehicle. Most limits are specified by volume; a few countries use BAC by mass, equivalent to a figure about 6% higher by volume.


0%

It is illegal to have any measurable alcohol in the blood while driving in these countries. Most jurisdictions have a tolerance slightly higher than zero to account for false positives and naturally occurring alcohol in the body. Some of the following jurisdictions have a general prohibition of alcohol. * Australia—Drivers who are learners or holders of a Provisional/Probationary licence * Bangladesh * Brazil * Brunei * Canada—new drivers undergoing
graduated licensing Graduated driver licensing systems (GDLS) are designed to provide new drivers of motor vehicles with driving experience and skills gradually over time in low-risk environments. There are typically three steps or stages through which new drivers ...
in Ontario, British Columbia, Newfoundland and Labrador and
Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Terri ...
; drivers under the age of 22 in Manitoba, New Brunswick, Northwest Territories, Nova Scotia, Ontario, Saskatchewan and in Quebec receive a 30-day suspension and 7-day vehicle seizure. Drivers in
Alberta Alberta ( ) is one of the thirteen provinces and territories of Canada. It is part of Western Canada and is one of the three prairie provinces. Alberta is bordered by British Columbia to the west, Saskatchewan to the east, the Northwest Terri ...
who are in the
graduated licensing Graduated driver licensing systems (GDLS) are designed to provide new drivers of motor vehicles with driving experience and skills gradually over time in low-risk environments. There are typically three steps or stages through which new drivers ...
program, regardless of age, are subject to the same 30-day/7-day suspensions/seizure policy. * Colombia —Zero Alcohol Tolerance law is effective since December 2013 * Czech Republic * Estonia * Fiji * Germany—for learner drivers, all drivers 18–21 and newly licensed drivers of any age for first two years of licence * Hungary * Iceland: The limit is 0.00%. You will not be fined until you reach 0.05% * Israel—24 µg per 100 mL (0.024%) of breath (penalties only apply above 26 µg per 100 mL (0.026%) of breath following lawsuits about sensitivity of devices used). New drivers, drivers under 24 years of age and commercial drivers 5 µg per 100 mL of breath.(0.005%) * Italy—for drivers in their first three years after gaining a driving license * Japan—drivers under the age of 20 because of not reaching legal drinking age. * Kuwait * New Zealand—drivers under the age of 20; drivers convicted of excess breath alcohol may be required to gain a zero-limit license. * Nepal * Oman * Qatar * Pakistan * Paraguay * Romania—beyond 0.04% drivers will not only receive a fine and have their license suspended, the offense will also be added to their criminal records. * Russian Federation—0% introduced in 2010, but discontinued in September 2013 * Saudi Arabia * Slovakia * Uruguay * United Arab Emirates * Vietnam


0.02%

* China * Faroe Islands * Netherlands (for drivers in their first five years after gaining a driving license) * Norway (road vehicles and sea vessels over 15 m), alternatively 0.1 mg/L of breath. * Poland (0.02% – 0.05% is a petty offence, over 0.05% is a criminal offence) * Puerto Rico * Russia (0.018% since September 2013) * Serbia * Sweden * Ukraine * United States—drivers under the age of 21 must have 0.02% or less on the federal level; however, most states have Zero Tolerance laws emplaced. Otherwise the limit is 0.08%, except in Utah, where it is 0.05%.


0.03%

* Belarus * Bosnia and Herzegovina (0.031%) * Chile * India * Japan * Korea


0.04%

* Lithuania (0.00% for car drivers in their first three years after gaining a driving license, motorcycle and truck drivers)


0.05%

* Argentina: 0.02% for motorbikes, 0.00% for truck, taxi, and bus drivers, 0.00% in the provinces of Cordoba and Salta * Australia (BAC stated by mass, not volume): 0.00% for
Australian Capital Territory The Australian Capital Territory (commonly abbreviated as ACT), known as the Federal Capital Territory (FCT) until 1938, is a landlocked federal territory of Australia containing the national capital Canberra and some surrounding townships. I ...
learner, provisional and convicted DUI drivers (changed down from 0.02% on December 1, 2010), 0.02% for truck/bus/taxi, 0.00% for learner drivers, provisional/probationary drivers (regardless of age), truck and bus drivers, driving instructors and DUI drivers in all other states * Austria: no limit for pedestrians; 0.08% for cycling; 0.05% generally for cars <7.5 t (driving licence B) and motorbikes (A); but 0,01% during learning (for driver and teacher or L17-assistant). During probation period (at least the first 3 years) or up to the age of 21, when license was handed out after July 1, 2017, when older (at least the first 2 years) or up to the age of 20 (A1, AM, L17, F), trucks (C >7.5 t), bus (D), drivers of taxi and public transport * Belgium (also for cyclists) * Bulgaria * Canada: (BAC stated by mass, not volume) Alberta, British Columbia, Ontario, Manitoba, Newfoundland, Nova Scotia, New Brunswick—provincial offence. Drivers have not committed a criminal offense, however a 3-day licence suspension and 3-day vehicle seizure occurs. * Costa Rica * Croatia: professional drivers, driving instructors and drivers of the vehicle categories C1, C1+E, C, C+E, D, D+E and H; the limit for other drivers is 0.50 mg/g, but they do get an additional separate fine if they cause an accident while having a blood alcohol level between 0 and 0,50 mg/g * Denmark (excl. Faroe Islands) * Finland * France: 0.025% for bus drivers. Between 0.05% and 0.08%, drivers can be fined €135 and have six points removed from their licence. Above 0.08%, the punishment is more severe with possible imprisonment of up to two years, heavy fines and licence suspension. * Germany (0.0% for learner drivers, all drivers 18–21 and newly licensed drivers of any age for first two years of licence; also, if the BAC exceeds 0.03%, driving is illegal if the driver is showing changes in behavior ("''Relative Fahruntüchtigkeit''")) * Greece (0.02% for drivers in their first two years after gaining a driving license) * Hong Kong * Ireland: 0.02% for professional, learner and novice drivers(drivers in their first two years after gaining a driving license) * Israel: 24 µg per 100 mL (0.024%) of breath (penalties only apply above 26 µg per 100 mL (0.026%) of breath due to lawsuits about sensitivity of devices used). This is equivalent to a BAC of 0.05. New drivers, drivers under 24 years of age and commercial drivers 5 µg per 100 mL of breath. This is equivalent to a BAC of 0.01. * Italy: 0.00% for drivers in their first three years after gaining a driving license * Latvia: 0.02% for drivers in their first two years after gaining a driving license * Luxembourg * Malta: 0.02% for drivers with a probationary driving licence and drivers of commercial vehicles, and 0.00% for drivers of buses, coaches and other passenger carrying vehicles. * Mauritius * Netherlands: 0.02% for drivers in their first five years after gaining a driving license * New Zealand * North Macedonia: 0.00% for drivers in their first two years after gaining a driving license * Peru * Philippines: 0.00% for taxicab and public transport drivers * Portugal: 0.02% for drivers holding a driver's licence for less than three years, professional drivers, and drivers of taxis, heavy vehicles, emergency vehicles, public transport of children and carrying dangerous goods. * Scotland: Scotland's drink-drive limit was reduced, by law, on 5 December 2014 from 0.08 to any of the following: 22 mcg of alcohol in 100 mL of breath, 50 mg of alcohol in 100 mL of blood, or 67 mg of alcohol in 100 mL of urine * Slovenia: 0.00% for drivers in their first two years after gaining a drivers licence, drivers under 21 and professional drivers, such as buses, trucks. * South Africa: 0.02% for professional drivers; to be changed for all to 0.00% by June 2020 * Spain (0.03% for drivers in their first two years after gaining a driving license and common carriers, such as buses and trucks) * Switzerland (0.00% for learner drivers, drivers which are in their first three years after gaining a drivers licence and for driving instructors) * Thailand: 0.02% for drivers who (1) hold a probationary driving licence or; (2) have a licence for different vehicle category or; (3) are under 20 years old or; (4) are disqualified and attempt to drive illegally * Taiwan: breath alcohol limit decreased from 0.25 to 0.15 from 13 June 2013 * Turkey * United States – Utah


0.06%

* The Bahamas


0.07%

* Honduras


0.08%

* Canada * England and Wales; 0.02% for operators of fixed-wing aircraft * Liechtenstein * Malaysia: 0.00 for Probationary Driving Licence holders * Mexico * New Zealand: Criminal offence * Norway: legal limit for sea vessels under 15 m * Northern Ireland: The government of Northern Ireland intends to reduce the general limit to 0.05%. * Puerto Rico: For drivers 18 years and older * SingaporeDriving In Singapore – Home
* Trinidad and Tobago * United States: Every state imposes mandatory penalties for operating a vehicle with a BAC level of 0.08% or greater, except Utah where the limit is 0.05%. Even below those levels drivers can have civil liability and other criminal guilt (e.g., in Arizona driving impairment to any degree caused by alcohol consumption can be a civil or criminal offense in addition to other offenses at higher blood alcohol content levels). Drivers under 21 (the most common U.S. legal drinking age) are held to stricter standards under zero tolerance laws adopted in varying forms in all states: commonly 0.01% to 0.05%. See
Alcohol laws of the United States by state In the United States, the Twenty-first Amendment to the United States Constitution grants each state and territory the power to regulate intoxicating liquors within their jurisdiction. As such, laws pertaining to the production, sale, distributi ...
. Federal Motor Carrier Safety Administration: 0.04% for drivers of a commercial vehicle requiring a
commercial driver's license A commercial driver's license (CDL) is a driver's license required in the United States to operate large and heavy vehicles (including trucks, buses, and trailers) or a vehicle of any size that transports hazardous materials or more than 15 p ...
and 0.01% for operators of common carriers, such as buses.


0.10%

*
Cayman Islands The Cayman Islands () is a self-governing British Overseas Territory—the largest by population in the western Caribbean Sea. The territory comprises the three islands of Grand Cayman, Cayman Brac and Little Cayman, which are located to the s ...


Breath alcohol content

In certain countries, alcohol limits are determined by the breath alcohol content (BrAC), not to be confused with blood alcohol content (BAC). * In Greece, the BrAC limit is 250 micrograms of alcohol per litre of breath. The limit in blood is 0.50 g/L. The BrAC limit for drivers in their first two years after gaining a driving license and common carriers are more restricted to 100 micrograms per litre of breath. ** BrAC 250–400 =
The euro sign () is the currency sign used for the euro, the official currency of the eurozone and unilaterally adopted by Kosovo and Montenegro. The design was presented to the public by the European Commission on 12 December 1996. It consists o ...
200 fine. ** BrAC 400–600 = €700 fine, plus suspension of driving license for 90 days (introduced in 2007) ** BrAC >600 = 2 months imprisonment, plus suspension of driving license for 180 days, plus €1,200 fine * In Hong Kong, the BrAC limit is 220 micrograms per litre of breath (as well as other defined limits) * In The Netherlands and Finland, the BrAC limit is 220 micrograms of alcohol per litre of breath (μg/L, colloquially known as "ugl" because some types of breathalyzer show the μ as 'u' due to screen size limitations). * In New Zealand, the BrAC limit is 250 micrograms of alcohol per litre of breath for those aged 20 years or over, and zero (meaning illegal to have any measurable breath alcohol content) for those aged under 20 years. * In Singapore, the BrAC limit is 350 micrograms of alcohol per litre of breath. * In Spain the BrAC limit is 250 micrograms of alcohol per litre of breath and 150 micrograms per litre of breath for drivers in their first two years after gaining a driving license and common carriers. * In England and Wales the BrAC limit is 350 micrograms of alcohol per litre of breath (as well as the above defined blood alcohol content). * In Scotland the BrAC limit is 220 micrograms of alcohol per litre of breath (as well as the above defined blood alcohol content). * In Trinidad and Tobago the BrAC limit is 35 micrograms of alcohol per 100 millilitres of breath (as well as the above defined blood alcohol content).


Other limitation schemes

* For South Korea, the penalties for different blood alcohol content levels include ** 0.01–0.049 = No penalty ** 0.05–0.09 = 100 days license suspension ** >0.10 = Cancellation of car license.


Test assumptions

Blood alcohol tests assume the individual being tested is average in various ways. For example, on average the ratio of blood alcohol content to breath alcohol content (the ''partition ratio'') is 2100 to 1. In other words, there are 2100 parts of alcohol in the blood for every part in the breath. However, the actual ratio in any given individual can vary from 1300:1 to 3100:1, or even more widely. This ratio varies not only from person to person, but within one person from moment to moment. Thus a person with a true blood alcohol level of 0.08% but a partition ratio of 1700:1 at the time of testing would have a 0.10 reading on a Breathalyzer calibrated for the average 2100:1 ratio. After fatal accidents, it is common to check the blood alcohol levels of involved persons. However, soon after death, the body begins to
putrefy Putrefaction is the fifth stage of death, following pallor mortis, algor mortis, rigor mortis, and livor mortis. This process references the breaking down of a body of an animal, such as a human, post-mortem. In broad terms, it can be view ...
, a biological process which produces ethanol. This can make it difficult to conclusively determine the blood alcohol content in autopsies, particularly in bodies recovered from water. For instance, following the
Moorgate tube crash The Moorgate tube crash occurred on 28 February 1975 at 8:46 am on the London Underground's Northern City Line; 43 people died and 74 were injured after a train failed to stop at the line's southern terminus, Moorgate station, and crashe ...
, the driver had a blood alcohol concentration of 80 mg/100 mL, but it could not be established how much of this could be attributed to natural decomposition.


Extrapolation

Retrograde
extrapolation In mathematics, extrapolation is a type of estimation, beyond the original observation range, of the value of a variable on the basis of its relationship with another variable. It is similar to interpolation, which produces estimates between kno ...
is the mathematical process by which someone's blood alcohol concentration at the time of driving is estimated by projecting backwards from a later chemical test. This involves estimating the absorption and elimination of alcohol in the interim between driving and testing. The rate of elimination in the average person is commonly estimated at 0.015 to 0.020 grams per deciliter per hour (g/dL/h), although again this can vary from person to person and in a given person from one moment to another. Metabolism can be affected by numerous factors, including such things as body temperature, the type of alcoholic beverage consumed, and the amount and type of food consumed. In an increasing number of states, laws have been enacted to facilitate this speculative task: the blood alcohol content at the time of driving is legally presumed to be the same as when later tested. There are usually time limits put on this presumption, commonly two or three hours, and the defendant is permitted to offer evidence to rebut this presumption. Forward extrapolation can also be attempted. If the amount of alcohol consumed is known, along with such variables as the weight and sex of the subject and period and rate of consumption, the blood alcohol level can be estimated by extrapolating forward. Although subject to the same infirmities as retrograde extrapolation—guessing based upon averages and unknown variables—this can be relevant in estimating BAC when driving and/or corroborating or contradicting the results of a later chemical test.


Metabolism

Alcohol is absorbed throughout the gastrointestinal tract, but more slowly in the stomach than in the small or large intestine. For this reason, alcohol consumed with food is absorbed more slowly, because it spends a longer time in the stomach. Furthermore,
alcohol dehydrogenase Alcohol dehydrogenases (ADH) () are a group of dehydrogenase enzymes that occur in many organisms and facilitate the interconversion between alcohols and aldehydes or ketones with the reduction of nicotinamide adenine dinucleotide (NAD+) to NADH ...
is present in the stomach lining. After absorption, the alcohol passes to the liver through the
hepatic portal vein The portal vein or hepatic portal vein (HPV) is a blood vessel that carries blood from the gastrointestinal tract, gallbladder, pancreas and spleen to the liver. This blood contains nutrients and toxins extracted from digested contents. Appr ...
, where it undergoes a first pass of metabolism before entering the general bloodstream. Alcohol is removed from the bloodstream by a combination of metabolism, excretion, and evaporation. Alcohol is metabolized mainly by the group of six enzymes collectively called alcohol dehydrogenase. These convert the ethanol into
acetaldehyde Acetaldehyde (IUPAC systematic name ethanal) is an organic chemical compound with the formula CH3 CHO, sometimes abbreviated by chemists as MeCHO (Me = methyl). It is a colorless liquid or gas, boiling near room temperature. It is one of the m ...
(an intermediate more toxic than ethanol). The enzyme
acetaldehyde dehydrogenase Acetaldehyde dehydrogenases () are dehydrogenase enzymes which catalyze the conversion of acetaldehyde into acetic acid. The oxidation of acetaldehyde to acetate can be summarized as follows: Acetaldehyde + NAD+ + Coenzyme A ↔ Acetyl-CoA + NAD ...
then converts the acetaldehyde into non-toxic acetic acid. Many physiologically active materials are removed from the bloodstream (whether by metabolism or excretion) at a rate proportional to the current concentration, so that they exhibit
exponential decay A quantity is subject to exponential decay if it decreases at a rate proportional to its current value. Symbolically, this process can be expressed by the following differential equation, where is the quantity and (lambda) is a positive rate ...
with a characteristic
half-life Half-life (symbol ) is the time required for a quantity (of substance) to reduce to half of its initial value. The term is commonly used in nuclear physics to describe how quickly unstable atoms undergo radioactive decay or how long stable ato ...
(see pharmacokinetics). This is not true for alcohol, however. Typical doses of alcohol actually saturate the enzymes' capacity, so that alcohol is removed from the bloodstream at an approximately constant rate. This rate varies considerably between individuals. Another sex-based difference is in the elimination of alcohol. People under 25, women, or people with liver disease may process alcohol more slowly. Falsely high BAC readings may be seen in patients with kidney or liver disease or failure. Such persons also have impaired acetaldehyde dehydrogenase, which causes acetaldehyde levels to peak higher, producing more severe hangovers and other effects such as flushing and tachycardia. Conversely, members of certain ethnicities that traditionally did not use alcoholic beverages have lower levels of alcohol dehydrogenases and thus "sober up" very slowly but reach lower aldehyde concentrations and have milder hangovers. The rate of detoxification of alcohol can also be slowed by certain drugs which interfere with the action of alcohol dehydrogenases, notably
aspirin Aspirin, also known as acetylsalicylic acid (ASA), is a nonsteroidal anti-inflammatory drug (NSAID) used to reduce pain, fever, and/or inflammation, and as an antithrombotic. Specific inflammatory conditions which aspirin is used to treat in ...
, furfural (which may be found in
fusel alcohol Fusel alcohols or fuselol, also sometimes called fusel oils in Europe, are mixtures of several higher alcohols (those with more than two carbons, chiefly amyl alcohol) produced as a by-product of alcoholic fermentation. The word ''Fusel'' is G ...
), fumes of certain solvents, many
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, and some
pyrazole Pyrazole is an organic compound with the formula C3H3N2H. It is a heterocycle characterized by a 5-membered ring of three carbon atoms and two adjacent nitrogen atoms, which are in ortho-substitution. Pyrazole is a weak base, with p''K''b 11.5 ( ...
compounds. Also suspected of having this effect are
cimetidine Cimetidine, sold under the brand name Tagamet among others, is a histamine H2 receptor antagonist that inhibits stomach acid production. It is mainly used in the treatment of heartburn and peptic ulcers. The development of longer-acting H2 rec ...
, ranitidine, and
acetaminophen Paracetamol, also known as acetaminophen, is a medication used to treat fever and mild to moderate pain. Common brand names include Tylenol and Panadol. At a standard dose, paracetamol only slightly decreases body temperature; it is inferior ...
(paracetamol). Currently, the only known substance that can increase the rate of alcohol metabolism is
fructose Fructose, or fruit sugar, is a ketonic simple sugar found in many plants, where it is often bonded to glucose to form the disaccharide sucrose. It is one of the three dietary monosaccharides, along with glucose and galactose, that are absorbe ...
. The effect can vary significantly from person to person, but a 100 g dose of fructose has been shown to increase alcohol metabolism by an average of 80%. Fructose also increases false positives of high BAC readings in anyone with proteinuria and hematuria, due to kidney-liver metabolism.Fructose & ethanol * * * * * * * * * * * * * * * * The peak of blood alcohol level (or concentration of alcohol) is reduced after a large meal.


Highest levels

There have been reported cases of blood alcohol content higher than 1%: * In 1982, a 24-year-old woman was admitted to the UCLA emergency room with a serum alcohol content of 1.51%, corresponding to a blood alcohol content of 1.33%. She was alert and oriented to person and place and survived. Serum alcohol concentration is not equal to nor calculated in the same way as blood alcohol content. * In 1984, a 30-year-old man survived a blood alcohol concentration of 1.5% after vigorous medical intervention that included dialysis and intravenous therapy with
fructose Fructose, or fruit sugar, is a ketonic simple sugar found in many plants, where it is often bonded to glucose to form the disaccharide sucrose. It is one of the three dietary monosaccharides, along with glucose and galactose, that are absorbe ...
. * In 1995, a man from Wrocław, Poland, caused a car accident near his hometown. He had a blood alcohol content of 1.48%; he was tested five times, with each test returning the same reading. He died a few days later of injuries from the accident. * In 2004, an unidentified Taiwanese woman died of alcohol intoxication after immersion for twelve hours in a bathtub filled with 40% ethanol. Her blood alcohol content was 1.35%. It was believed that she had immersed herself as a response to the SARS epidemic. * In South Africa, a man driving a
Mercedes-Benz Vito The Mercedes-Benz Vito is a mid-sized light commercial vehicle (LCV) produced by Mercedes-Benz, available as a panel van, chassis cab, or multi-purpose vehicle (MPV), carrying cargo or up to eight passengers. In the Mercedes-Benz van lineup, it i ...
light van containing 15 sheep allegedly stolen from nearby farms was arrested on December 22, 2010, near Queenstown in Eastern Cape. His blood had an alcohol content of 1.6%. Also in the vehicle were five boys and a woman, who were also arrested. * On 26 October 2012, a man from
Gmina Olszewo-Borki __NOTOC__ Gmina Olszewo-Borki is a rural gmina (administrative district) in Ostrołęka County, Masovian Voivodeship, in east-central Poland. Its seat is the village of Olszewo-Borki, which lies approximately 3 kilometres (2 mi) south-west of Ostro ...
, Poland, who died in a car accident, recorded a blood alcohol content of 2.23%; however, the blood sample was collected from a wound and thus possibly contaminated. * On 26 July 2013 a 40-year-old man from
Alfredówka Alfredówka is a village in the administrative district of Gmina Nowa Dęba, within Tarnobrzeg County, Subcarpathian Voivodeship, in south-eastern Poland. It lies approximately north of Nowa Dęba, south of Tarnobrzeg, and north of the regio ...
, Poland, was found by Municipal Police Patrol from
Nowa Dęba Nowa Dęba is a town in Tarnobrzeg County, Subcarpathian Voivodeship, Poland, with a population of 11,310, as of 2 June 2009. Nowa Dęba belongs to historic Lesser Poland, and is located in the Sandomierz Forest, along European route E371. Near t ...
lying in the ditch along the road in Tarnowska Wola. At the hospital, it was recorded that the man had a blood alcohol content of 1.374%. The man survived.


References


Citations


General and cited references

* Carnegie Library of Pittsburgh. Science and Technology Department. ''The Handy Science Answer Book''. Pittsburgh: The Carnegie Library, 1997. . * * Taylor, L., and S. Oberman. ''Drunk Driving Defense'', 6th edition. New York: Aspen Law and Business, 2006. .


External links


Estimated alcohol
{{Authority control Alcohol law Concentration indicators Driving under the influence Metabolism