Alcohol can stay in your system for varying lengths of time depending on the type of test used and individual factors such as metabolism, amount consumed, body weight, and liver function.

Detection Times by Test Type

• Blood: Alcohol can be detected in the blood for up to about 12 hours after drinking

• Breath: Breathalyzers can detect alcohol for approximately 12 to 24 hours after consumption, though usually closer to 12 hours; some sources note it may be detected up to 24 hours in some cases

• Urine: Traditional urine tests detect alcohol for 12 to 24 hours, but more sensitive tests measuring metabolites like ethyl glucuronide (EtG) or phosphatidylethanol (PEth) can detect alcohol metabolites for up to 3 to 14 days, especially after heavy or chronic drinking

• Saliva: Alcohol can be detected in saliva for 12 to 24 hours after drinking

• Hair: Alcohol and its metabolites can be detected in hair follicles for up to 90 days after the last drink

Metabolism Rate

The body metabolizes alcohol at an average rate of about one standard drink per hour, though this varies by individual factors such as liver size, genetics, health, and whether food was consumed

. The liver is the primary organ responsible for breaking down alcohol, but enzymes in the stomach also contribute to early metabolism

Summary Table

Test Type| Typical Detection Window
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Blood| Up to 12 hours
Breath| 12 to 24 hours
Urine| 12 to 24 hours (traditional); up to 3-14 days (metabolite tests)
Saliva| 12 to 24 hours
Hair| Up to 90 days

These detection windows can be longer in cases of heavy or chronic alcohol use and vary based on individual physiology and the sensitivity of the testing method used

. In summary, alcohol typically leaves the bloodstream within about 12 hours, but metabolites can be detected in urine and hair for days to months after drinking.