Blood alcohol content

Blood alcohol content
Ethanol
SynonymsBlood alcohol concentration, blood ethanol concentration, blood alcohol level, blood alcohol
LOINC5639-0, 5640-8, 15120-9, 56478-1

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 grams of alcohol per liter of blood.[1][2] In different countries, the maximum permitted BAC when driving ranges from the limit of detection (zero tolerance) to 0.08% (0.8 g/L).[3][2] BAC levels above 0.40% (4 g/L) can be potentially fatal.[1]

According to Guinness World Records, 1.374% (13.74 g/L) is the highest BAC ever recorded in a human who survived the ordeal.[4] The record was set in July 2013 by an unidentified Polish man found unconscious by the side of a road in the village of Tarnowska Wola, in south-east Poland. First responders reportedly did not believe the initial BAC readings taken at the scene, possibly due to it being almost 69 times greater than the Polish legal limit of 0.02% (0.2 g/L). However, the reading was later confirmed after the man was transported to a near by hospital.[4]

Units of measurement

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BAC is generally defined as a fraction of weight of alcohol per volume of blood, with an SI coherent derived unit of kg/m3 or equivalently grams per liter (g/L). Countries differ in how this quantity is normally expressed. Common formats are listed in the table below. For example, the US and many international publications present BAC as a percentage, such as 0.05%. This would be interpreted as 0.05 grams per deciliter of blood. This same concentration could be expressed as 0.5‰ or 50 mg% in other countries.[5]

Sign Units Used in
1 percent (%), 1 g%[6] 1 g/dL = 1 cg/mL = 10 g/L = 1 g/100 mL US, Australia,[6][7] Canada[8]
1 per mille (‰)[a] 1 g/L = 1 mg/mL = 100 mg/1 dL Austria,[6] Belgium,[6] Bulgaria,[citation needed] Czech Republic,[citation needed] Denmark,[citation needed] France,[6] Germany,[6] Latvia,[citation needed] Lithuania,[citation needed] Netherlands,[citation needed] Poland,[10] Portugal,[citation needed] Romania,[citation needed] Russia,[citation needed] Slovenia,[citation needed] Spain,[6] Sweden,[citation needed] Switzerland,[citation needed] Turkey[citation needed]
1 mg%[6] 1 mg/dL = 0.01 g/L = 1 mg/100 mL United Kingdom[11] Ireland, Canada, New Zealand[6]

It is also possible to use other units. For example, in the 1930s Widmark measured alcohol and blood by mass, and thus reported his concentrations in units of g/kg or mg/g, weight alcohol per weight blood. Blood is denser than water and 1 mL of blood has a mass of approximately 1.055 grams, thus a mass-volume BAC of 1 g/L corresponds to a mass-mass BAC of 0.948 mg/g. Sweden, Denmark, Norway, Finland, Germany, and Switzerland use mass-mass concentrations in their laws,[6] but this distinction is often skipped over in public materials,[12] implicitly assuming that 1 L of blood weighs 1 kg.[13]

In pharmacokinetics, it is common to use the amount of substance, in moles, to quantify the dose. As the molar mass of ethanol is 46.07 g/mol, a BAC of 1 g/L is 21.706 mmol/L (21.706 mM).[14]

Effects by alcohol level

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Further information: Short-term effects of alcohol consumption
Alcohol level Effects Ref
BAC (%) per mille (‰) mg (%)
0.01 – 0.05 0.1 – 0.5 10 – 50 Mild relaxation and reduced social inhibition; impaired judgment and coordination [15]
0.06 – 0.2 0.6 – 2 60 – 200 Emotional swings, impaired vision, hearing, speech, and motor skills [15]
0.2 – 0.3 2 – 3 200 – 300 Urinary incontinence, vomiting, and symptoms of alcohol intoxication [16][17]
0.3 – 0.4 3 – 4 300 – 400 Potential total loss of consciousness; signs of severe alcohol intoxication [16][17]
> 0.4 > 4 > 400 Potentially fatal, may result in a coma or respiratory failure [16][17]

The magnitude of sensory impairment may vary in people of differing weights.[18] The NIAAA defines the term "binge drinking" as a pattern of drinking that brings a person's blood alcohol concentration (BAC) to 0.08 grams percent or above.[15]

Estimation

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Direct measurement

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Blood samples for BAC analysis are typically obtained by taking a venous blood sample from the arm. A variety of methods exist for determining blood-alcohol concentration in a blood sample.[19] Forensic laboratories typically use headspace-gas chromatography combined with mass spectrometry or flame ionization detection,[20] as this method is accurate and efficient.[19] Hospitals typically use enzyme multiplied immunoassay, which measures the co-enzyme NADH. This method is more subject to error but may be performed rapidly in parallel with other blood sample measurements.[21]

In Germany, BAC is determined by measuring the serum level and then converting to whole blood by dividing by the factor 1.236. This calculation underestimates BAC by 4% to 10% compared to other methods.[22]

By breathalyzer

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Joke "Breathalyser 'pint'" beer glass, about 2 inches tall, dating from around the time of the introduction of breathalyzers in the United Kingdom, in 1967
Main article: Breathalyzer

The amount of alcohol on the breath can be measured, without requiring drawing blood, by blowing into a breathalyzer, resulting in a breath alcohol content (BrAC). The BrAC specifically correlates with the concentration of alcohol in arterial blood, satisfying the equation BACarterial = BrAC × 2251 ± 46. Its correlation with the standard BAC found by drawing venous blood is less strong.[23] Jurisdictions vary in the statutory conversion factor from BrAC to BAC, from 2000 to 2400. Many factors may affect the accuracy of a breathalyzer test,[24] but they are the most common method for measuring alcohol concentrations in most jurisdictions.[25]

By intake

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Main article: Pharmacology of ethanol § Modeling

Blood alcohol content can be quickly estimated by a model developed by Swedish professor Erik Widmark in the 1920s.[26] The model corresponds to a pharmacokinetic single-compartment model with instantaneous absorption and zero-order kinetics for elimination. The model is most accurate when used to estimate BAC a few hours after drinking a single dose of alcohol in a fasted state, and can be within 20% CV of the true value.[27][28] It is not at all realistic for the absorption phase, and is not accurate for BAC levels below 0.2 g/L (alcohol is not eliminated as quickly as predicted) and consumption with food (overestimating the peak BAC and time to return to zero).[29][6] The equation varies depending on the units and approximations used, but in its simplest form is given by:[30]

where:

  • EBAC is the estimated blood alcohol concentration (in g/L)
  • A is the mass of alcohol consumed (g).
  • T is the amount of time during which alcohol was present in the blood (usually time since consumption began), in hours.
  • β is the rate at which alcohol is eliminated, averaging around 0.15 g/L/hr.[31]
  • Vd is the volume of distribution (L); typically body weight (kg) multiplied by 0.71 L/kg for men and 0.58 L/kg for women[32][33] although estimation using TBW is more accurate.[34]

A standard drink, defined by the WHO as 10 grams of pure alcohol,[35] is the most frequently used measure in many countries. Examples:

  • A 80 kg man drinks 20 grams ethanol. After one hour:

  • A 70 kg woman drinks 10 grams ethanol. After one hour:

In terms of fluid ounces of alcohol consumed and weight in pounds, Widmark's formula can be simply approximated as[26]

for a man or

for a woman, where EBAC and β factors are given as g/dL (% BAC), such as a β factor of 0.015% BAC per hour.[26]

By standard drinks

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Main article: Standard drink
United States standard drinks of beer, malt liquor, wine, and spirits compared. Each contains about 14 grams or 17.7 mL of ethanol.

The examples above define a standard drink as 0.6 fluid ounces (14 g or 17.7 mL) of ethanol, whereas other definitions exist, for example 10 grams of ethanol.

Approximate blood alcohol percentage (by volume)[36]
Based on one drink having 0.5 US fl oz (15 mL) alcohol by volume
Drinks Sex Body weight
40 kg
90 lb 		45 kg
100 lb 		55 kg
120 lb 		64 kg
140 lb 		73 kg
160 lb 		82 kg
180 lb 		91 kg
200 lb 		100 kg
220 lb 		109 kg
240 lb
1 Male – 0.04 0.03 0.03 0.02 0.02 0.02 0.02 0.02
Female 0.05 0.05 0.04 0.03 0.03 0.03 0.02 0.02 0.02
2 Male – 0.08 0.06 0.05 0.05 0.04 0.04 0.03 0.03
Female 0.10 0.09 0.08 0.07 0.06 0.05 0.05 0.04 0.04
3 Male – 0.11 0.09 0.08 0.07 0.06 0.06 0.05 0.05
Female 0.15 0.14 0.11 0.10 0.09 0.08 0.07 0.06 0.06
4 Male – 0.15 0.12 0.11 0.09 0.08 0.08 0.07 0.06
Female 0.20 0.18 0.15 0.13 0.11 0.10 0.09 0.08 0.08
5 Male – 0.19 0.16 0.13 0.12 0.11 0.09 0.09 0.08
Female 0.25 0.23 0.19 0.16 0.14 0.13 0.11 0.10 0.09
6 Male – 0.23 0.19 0.16 0.14 0.13 0.11 0.10 0.09
Female 0.30 0.27 0.23 0.19 0.17 0.15 0.14 0.12 0.11
7 Male – 0.26 0.22 0.19 0.16 0.15 0.13 0.12 0.11
Female 0.35 0.32 0.27 0.23 0.20 0.18 0.16 0.14 0.13
8 Male – 0.30 0.25 0.21 0.19 0.17 0.15 0.14 0.13
Female 0.40 0.36 0.30 0.26 0.23 0.20 0.18 0.17 0.15
9 Male – 0.34 0.28 0.24 0.21 0.19 0.17 0.15 0.14
Female 0.45 0.41 0.34 0.29 0.26 0.23 0.20 0.19 0.17
10 Male – 0.38 0.31 0.27 0.23 0.21 0.19 0.17 0.16
Female 0.51 0.45 0.38 0.32 0.28 0.25 0.23 0.21 0.19
Subtract approximately 0.01 every 40 minutes after drinking.

By training

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If individuals are asked to estimate their BAC, then given accurate feedback via a breathalyzer, and this procedure is repeated a number of times during a drinking session, studies show that these individuals can learn to discriminate their BAC, to within a mean error of 9 mg/100 mL (0.009% BAC).[37] The ability is robust to different types of alcohol, different drink quantities, and drinks with unknown levels of alcohol. Trained individuals can even drink alcoholic drinks so as to adjust or maintain their BAC at a desired level.[38] Training the ability does not appear to require any information or procedure besides breathalyzer feedback, although most studies have provided information such as intoxication symptoms at different BAC levels. Subjects continue to retain the ability one month after training.[39]

Post-mortem

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After fatal accidents, it is common to check the blood alcohol levels of involved persons. However, soon after death, the body begins to putrefy, 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.[40][41][42][43] For instance, following the 1975 Moorgate tube crash, the driver's kidneys 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.[44] Newer research has shown that vitreous (eye) fluid provides an accurate estimate of blood alcohol concentration that is less subject to the effects of decomposition or contamination.[45]

[edit]
Main article: Drunk driving law by country
Map of Europe showing countries' blood alcohol limits as defined in g/dL for the general population

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.

Test assumptions

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Extrapolation

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Retrograde extrapolation 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),[46] 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

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Main article: Pharmacology of ethanol § Pharmacokinetics

The pharmacokinetics of ethanol are well characterized by the ADME acronym (absorption, distribution, metabolism, excretion). Besides the dose ingested, factors such as the person's total body water, speed of drinking, the drink's nutritional content, and the contents of the stomach all influence the profile of blood alcohol content (BAC) over time. Breath alcohol content (BrAC) and BAC have similar profile shapes, so most forensic pharmacokinetic calculations can be done with either. Relatively few studies directly compare BrAC and BAC within subjects and characterize the difference in pharmacokinetic parameters. Comparing arterial and venous BAC, arterial BAC is higher during the absorption phase and lower in the postabsorptive declining phase.[47]

Highest levels

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See also: List of deaths through alcohol
Date BAC (%) Location Description Result (died or survived) Cause of Death (If Died)
1982 1.33 BAC, approximated from 1.51 SAC Los Angeles, California, USA 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.[48] Serum alcohol concentration is not equal to nor calculated in the same way as blood alcohol content.[49] Survived
1984 1.50 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.[50] Survived
1995 1.48 Wrocław, Poland 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.[51] Died Injuries from a car accident
2004 1.35 Taiwan 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 early 2000s outbreak of SARS.[52] Died Alcohol intoxication
22 Dec 2010 1.60 Queenstown, South Africa In South Africa, a man driving a Mercedes-Benz Vito 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.[53][dubious – discuss] Survived
26 Oct 2012 2.23 (possible contamination) Gmina Olszewo-Borki, Poland A man from Gmina Olszewo-Borki, 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.[51] Died Injuries from a car accident
26 July 2013 1.374 Alfredówka, Poland A 30-year-old man from Alfredówka, Poland, was found by Municipal Police Patrol from Nowa Dęba lying in the ditch along the road in Tarnowskiej Woli. At the hospital, it was recorded that the man had a blood alcohol content of 1.374%. The man survived.[54][55] Survived

Notes

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  1. ^ In Germany, Finland, Netherlands and Sweden, the local language term promille is used; this is occasionally provided as a courtesy in English texts.[9]

References

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Citations

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  55. ^ "Informacje".

General and cited references

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  • Carnegie Library of Pittsburgh. Science and Technology Department. The Handy Science Answer Book. Pittsburgh: The Carnegie Library, 1997. ISBN 978-0-7876-1013-5.
  • Perham, Nick; Moore, Simon C.; Shepherd, Jonathan; Cusens, Bryany (2007). "Identifying drunkenness in the night-time economy". Addiction. 102 (3): 377–80. doi:10.1111/j.1360-0443.2006.01699.x. PMID 17298644.
  • Taylor, L., and S. Oberman. Drunk Driving Defense, 6th edition. New York: Aspen Law and Business, 2006. ISBN 978-0-7355-5429-0.
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