How Long Is Alcohol in Your Body? Alcohol Detection Times

As accepted as alcohol is in many social environments, it is important to remember that it is a substance that can affect the brain and central nervous system.

And while alcohol is perfectly legal for adults in the United States, there are still some situations where you may be required to take a breathalyzer test, a blood alcohol test, or a urine test to see if there is alcohol in your system.

This leads many to wonder how long alcohol stays in your body after drinking.

The answer actually depends on a variety of factors.

How Does the Body Process Alcohol?

Understanding how the body processes alcohol can help to understand why its detection methods can vary so much.

When you drink alcohol, it is absorbed through the digestive tract, primarily in the small intestine, and enters the bloodstream where it travels throughout your entire body to the brain, where it can affect coordination, reaction times, decision-making abilities, mood, and speech.[1]

Alcohol is mostly broken down in the liver, where an enzyme called alcohol dehydrogenase converts it into acetaldehyde, a toxic substance.[2] To remove it, another enzyme called aldehyde dehydrogenase converts acetaldehyde into acetate, which is finally broken down into water and carbon dioxide and eliminated from the body.

This process happens every time you drink and it takes time. Even under ideal conditions, the liver can only process a certain amount of alcohol per hour, and nothing can make it metabolize any faster, including many “sobering” home remedies like drinking coffee or a glass of water. This may change how you feel after drinking, but neither accelerates alcohol’s removal or lowers your blood alcohol concentration (BAC), which is the amount of alcohol in your bloodstream..

What Is Blood Alcohol Concentration?

BAC refers to the amount of alcohol in your bloodstream, which is influenced by three variables: how much alcohol you drank, how quickly you drank it, and how your body processes the alcohol.[3]

The same amount of alcohol can produce different BAC levels in different people, which is why two people can drink the same number of drinks and experience different levels of impairment.

Standard Drink Amounts

Some people are often confused when they either feel more intoxicated than they think they should or fail a breathalyzer test after they’ve only had one or two drinks.

That is because it is the amount of alcohol in the drinks that matters more than how many “servings” someone had. The number of glasses of wine or mugs of beer doesn’t always accurately reflect the amount of alcohol you’re drinking.

To make this more clear, it is important to remember that a “standard drink” contains approximately 14 grams or 0.6 fluid ounces of pure alcohol.[4]

This amount is roughly equivalent to:

• 12 ounces of regular beer containing 5% alcohol
• 5 ounces of wine containing 12% alcohol
• 1.5 ounces of distilled spirits containing 40% alcohol

This is why you can drink just one large glass of wine, but still have consumed 2 or 3 “standard” servings of alcohol.

Equally worth remembering is that the same amount of alcohol can cause different levels of intoxication in different people depending on multiple factors, including body composition, gender, liver function, any medications being taken, and how much food is in the system before drinking begins.[5]

Smaller people and women can reach a higher BAC after drinking the same amount as someone larger. Liver impairments slow down alcohol metabolism, causing alcohol to stay in the bloodstream longer. Eating a meal before drinking can slow alcohol’s absorption, causing BAC levels to rise more slowly.

These are just some of the reasons why two people can have the same amount of alcohol but have very different BAC levels.

Alcohol Detection Times by Test Method

How long alcohol can be detected in the body differs greatly depending on the type of test. These time frames are approximate detection ranges for each form of testing. Each lab or court uses its own methods.

Breath Tests

Breath testing evaluates alcohol concentrations in exhaled breath to provide an approximation of blood alcohol concentration.

They are mainly used to detect recent drinking, which is why they are commonly used in traffic stops or workplace testing. Breath testing can show whether alcohol is currently in a person’s body but cannot detect past drinking patterns.

This type of test can detect alcohol for around 12 to 24 hours after drinking, though this timeframe can vary based on how your body processes alcohol and other factors discussed above.[6]

Blood Tests

Blood testing measures the concentration of alcohol in a person’s blood. It is often used when an accurate blood alcohol level is required, such as after a motor vehicle accident or in medical emergencies involving suspected intoxication, alcohol poisoning, or when an accurate BAC reading is needed for legal purposes.

Standard blood tests are used to detect recent drinking and alcohol can usually be detected in blood for up to 12 hours after your last drink.[7] If specialized testing is needed, there are phosphatidylethanol (PEth) tests that are used to detect biomarkers associated with alcohol instead of the ethanol itself and provide a much longer detection window.

Urine Tests

Common urine tests are designed to identify either alcohol itself or its metabolites, including ethyl glucuronide (EtG) and ethyl sulfate (EtS). The tests that look for ethanol are used to detect recent drinking, while metabolite testing is used to identify alcohol use after the alcohol itself has been eliminated. EtG and EtS testing is most often seen in treatment programs, monitoring programs, or other settings like probation or courts, where detecting recent alcohol use is more important than current impairment

Tests using EtG or EtS can detect alcohol use for approximately 80 hours after drinking, depending on several variables, including the amount consumed, test sensitivity, and other individual factors.[8]

Saliva Tests

Saliva testing can detect recent drinking. It is less common than breath, blood, or urine testing but may be used in select situations such as after a traffic accident, workplace accident, to test under reasonable suspicion, or other settings where recent alcohol use, not current impairment, needs to be confirmed.

Saliva testing reflects alcohol in the bloodstream and has a relatively short testing window of around 12 to 24 hours, depending on the test and how much alcohol was consumed.[9]

Hair Follicle Tests

Hair testing doesn’t look for alcohol itself, but rather patterns of long-term use by detecting metabolites that result from long-term drinking.

Depending on the length of hair analyzed and the testing methods used, hair testing may detect patterns of alcohol use for over three months.[10] Hair testing is used for longer-term monitoring, and not appropriate for detecting recent drinking or if a person is currently impaired.

Factors That Influence How Long Alcohol Stays in Your Body

How long alcohol can be detected depends on numerous factors that vary from person to person.

Examples include:

• Age: Older adults generally metabolize alcohol more slowly than younger people due to decreased muscle mass, body water, liver function, and overall health.
• Weight and Body Composition: Differences in weight and body composition mean people have different body water content and fat distribution, so they reach different peak BAC values after drinking the same amount.
• Gender: Women typically reach higher BAC values than men after drinking the same amount due to differences in body water content, body composition, and metabolism.
• Food Intake: Eating before drinking can delay absorption and reduce peak BAC, while drinking on an empty stomach tends to produce higher peak BAC values sooner.
• Liver Health: Normal liver function allows efficient metabolism and elimination of alcohol, while liver disease, failure, or injury can impair this process.
• Medications: Certain medications can affect how alcohol is metabolized or eliminated, or increase the dangers of drinking by amplifying side effects.
• Amount of Alcohol Consumed: Drinking more alcohol or drinking a large amount in a short period prolongs the time required to fully metabolize it.
• Frequent or Heavy Drinking: Regular heavy drinking can affect how long certain alcohol biomarkers remain detectable, particularly on tests designed to identify longer-term patterns of alcohol use.

Because all of these factors cause wide variability from person to person, there is no definitive answer to how long it takes to get rid of alcohol. The safest approach is to assume that if you have been drinking recently, there are likely lingering effects that could impair your decision-making, judgment, and reaction time.

Is There a Way To Get Rid Of Alcohol Sooner?

Many people look for ways to clear alcohol from their bodies faster before returning to work, driving, appointments, or to pass an alcohol test. Unfortunately, there is no established way to speed up the process.

While drinking water may relieve dehydration, eating may relieve nausea or help with low blood sugar, sleeping can provide rest, and coffee or caffeine may help you feel more awake, none of these will make the liver eliminate the remaining alcohol in your body any faster.

Your body will naturally eliminate alcohol at its own metabolic pace. Attempting to mask alcohol use or detox on your own can be dangerous. If you believe you cannot stop drinking despite needing to, or you have signs of dependence, addiction, or withdrawal, seeking help from medical professionals or substance use specialists can be the first step toward treating alcohol addiction.

When Does Excessive Alcohol Use Become Hazardous?

Excessive drinking can lead to acute consequences such as slowed breathing, irregular heartbeat, or hypothermia when excessive amounts of alcohol raise blood alcohol concentration high enough to disrupt normal body functions.[11]

Signs of acute intoxication or alcohol poisoning include:

• Confusion
• Vomiting
• Seizures
• Slow or irregular breathing
• Pale, blue-tinged, or clammy skin
• Low body temperature
• Trouble staying awake
• Loss of consciousness

Call 911 immediately if you suspect acute intoxication or alcohol poisoning. Do not leave the person alone, and do not try to have them “sleep it off.”

Getting Treatment for Alcohol Addiction

If you are researching this topic because of worries about an upcoming or prior alcohol test, it is worth taking a step back and seeing if your concern about a test is pointing to a larger problem. 

If your alcohol use is becoming something hard to control, help is available and you should not try to manage it on your own.

For those with a history of heavy drinking, trying to quit on your own could even be medically dangerous. Detoxification may be medically necessary to help manage severe alcohol withdrawal.

Alcohol withdrawal symptoms can be physical, emotional, and potentially life-threatening, and can include anxiety, shaking, nervousness, sweating, vomiting, trouble sleeping, high blood pressure, seizures, and delirium tremens.[12] Because of these risks, people with alcohol addiction should consult medical professionals before quitting abruptly.