How long does alcohol stay in your system?
About six hours in blood, up to 72 in urine with an EtG test, and 90 days in hair. Your liver clears roughly one drink an hour, and nothing you have heard about speeding that up works.
Two Georgia locations
Woodstock, GA 30188
Hiram, GA 30141
Saturday–Sunday 9:00 AM – 12:00 PM
Alcohol is detectable in blood for around 6 hours, on a breathalyzer for 12 to 24 hours, in saliva for 12 to 24 hours, and in urine for up to 72 hours using an EtG test that looks for a metabolite rather than ethanol itself. Hair testing can detect alcohol metabolites for up to 90 days.
By test type
Alcohol detection windows
| Test | Detection window | What it measures |
|---|---|---|
| Blood | Up to 6 hours | Blood Alcohol Content at the moment of the draw |
| Breathalyzer | 12–24 hours | Estimated BAC from alcohol vapor in the lungs |
| Saliva | 12–24 hours | Alcohol present in oral fluid |
| Urine (standard) | 12–24 hours | Ethanol itself |
| Urine (EtG) | Up to 72 hours | Ethyl glucuronide, a metabolite — hence the longer window |
| Hair | Up to 90 days | Metabolites incorporated into the growing shaft |
The rate is fixed
One drink an hour, and nothing changes it
Alcohol absorbs quickly — around 20% through the stomach and 80% through the upper small intestine — and reaches the brain within minutes. Food slows absorption but does not reduce the total amount.
The liver then does the work, using alcohol dehydrogenase to convert alcohol into acetaldehyde (toxic, and responsible for most of what a hangover feels like), then aldehyde dehydrogenase to convert that into acetate.
It processes about one standard drink per hour, roughly 0.015% BAC. That rate is fixed. Anything you drink faster than that simply circulates until the liver catches up.
Coffee, cold showers and exercise change how alert you feel and nothing about your BAC. That gap between feeling sober and being sober is where a great deal of harm happens.
What changes it
Why the same drinks affect people differently
Sex
Lower total body water, higher body fat percentage and less active stomach alcohol dehydrogenase mean women reach higher BACs from the same amount.
Food
Eating slows absorption and flattens the peak. It does not reduce how much alcohol is in you.
Body composition
Muscle holds more water than fat, so a more muscular person of the same weight reaches a lower BAC.
Liver health
Fatty liver, hepatitis or cirrhosis all impair metabolism and extend how long alcohol stays in your system.
Medications
Antidepressants, painkillers, antibiotics and sedatives all interact. Some prolong effects, some create dangerous combinations.
Tolerance
Does not speed up metabolism. It masks intoxication, which usually means drinking more and clearing it for longer.
Alcohol withdrawal is the one that can kill you
Most substances on this site produce withdrawal that is miserable rather than dangerous. Alcohol is different. Heavy daily drinking followed by an abrupt stop can cause seizures and delirium tremens, and it kills people every year.
If you drink daily and a day without it brings shaking, sweating, nausea or anxiety, do not simply stop on a Monday to see what happens. Speak to a clinician first — even if that clinician is not us. See alcohol detox and the alcohol withdrawal timeline.
Overdose
How BAC maps to risk
0.06–0.15% — impaired speech, memory, coordination and balance. Driving ability is substantially compromised well below the legal limit.
0.16–0.30% — severe impairment. Blackouts, vomiting, loss of consciousness, and markedly poor judgment.
0.31% and above — critical overdose risk. Breathing and body temperature regulation become severely suppressed. Coma and death are possible.
Signs of alcohol poisoning include confusion, inability to stay conscious, vomiting while unresponsive, cold or clammy skin, a pale or bluish complexion, and slow or irregular breathing. Call 911.
Risk rises sharply with binge drinking and again when alcohol is combined with opioids or benzodiazepines, since all three suppress breathing.
Getting help
If a day without drinking makes you physically unwell, that is dependence
Alcohol detox at our Woodstock and Hiram clinics is medically supervised, runs to 7:00 PM, and you sleep at home.
Common questions
Alcohol detection, answered
How long does alcohol stay in your urine?
Up to 72 hours with an EtG test, which looks for ethyl glucuronide, a metabolite. A standard urine test measuring ethanol itself has a much shorter window of roughly 12 to 24 hours.
How long does alcohol stay in your blood?
Around 6 hours. Blood tests measure Blood Alcohol Content at the moment of the draw, so they capture recent drinking only.
How long does alcohol show on a breathalyzer?
Typically 12 to 24 hours after the last drink, depending on how much was consumed.
How long does alcohol stay in your hair?
Alcohol metabolites can be detected in hair for up to 90 days, giving a long historical picture rather than a snapshot.
Can I sober up faster?
No. Your liver processes roughly one standard drink per hour and nothing changes that. Coffee, cold showers and exercise make you feel more alert without lowering your BAC — which is precisely why people drive when they should not.
Why do women process alcohol differently?
Lower total body water, generally higher body fat percentage, and less active alcohol dehydrogenase in the stomach. The same drink produces a higher BAC.
What counts as a standard drink?
About 14 grams of pure alcohol — a 12-ounce beer at 5%, a 5-ounce glass of wine at 12%, or 1.5 ounces of spirits at 40%.
What is a dangerous BAC?
Above 0.31% carries critical overdose risk, with severe suppression of breathing and body temperature. Between 0.16% and 0.30% brings severe impairment, blackouts and vomiting.
Is alcohol withdrawal dangerous?
Yes — it is the most medically dangerous withdrawal we treat. Unsupervised, it can cause seizures and delirium tremens, and it can be fatal. Never stop heavy daily drinking alone without speaking to a clinician.
How do I know if I have a problem?
The clinical marker is not how much you drink compared to others. It is whether stopping produces physical symptoms, and whether you have tried to cut down and been unable to.
Woodstock & Hiram, GA
Never stop heavy daily drinking alone. Call first.
One conversation tells you whether outpatient detox is a fit, what your insurance covers, and how soon you could start.
678-506-7611
Woodstock ·
Hiram ·
Mon–Fri 7:00 AM – 7:00 PM
Sat–Sun 9:00 AM – 12:00 PM