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22 years
Does getting a normal blood test reveal the level of alcohol in the blood. And how much does it take the alcohole to leave the blood.
Sep 8, 2014

Dr. Zakia Dimassi Pediatrics
On average, the body needs about one hour to break down one unit of alcohol. The body's ability to metabolize alcohol, however, is affected by a number of factors, which include:
Weight
Gender
Age
Metabolic rate (how much food you how quickly or slowly your body turns food into energy have eaten)
Type and strength of the alcohol
If you're taking medication and, if so, what type
If you have liver problems .

One unit is equivalent to 10ml or 8g of pure alcohol. There are roughly:
2.1 units in a standard glass (175ml) of average-strength wine (12%)
3 units in a large glass (250ml) of average-strength wine (12%)
2 units in a pint of low-strength lager, beer or cider (3.6%)
3 units in a pint of higher-strength lager, beer or cider (5.2%)
1 unit in a single measure of spirits (25ml)

If you drink a large (250ml) glass of wine, your body requires approximately three hours to break down the alcohol.
If you drink one pint of beer, your body takes about two hours to break it down.
Again, this time can vary depending on the above mentioned factors.
If you have a few drinks, it can take many hours for the alcohol to get cleared from your system. The alcohol could still be in your blood the next day.
Visit the below link where they provide charts based on gender and weight for the time required for the blood alcohol concentration (BAC) to drop to zero:

http://www.health.arizona.edu/health_topics/aod/hourstozerobac.htm
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