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A 32-year-old female asked:

How long does it take after having one beer to have a negative blood alcohol test?

1 doctor answer • 2 doctors weighed in
Dr. Alan Wartenberg
A Verified Doctoranswered
Addiction Medicine 51 years experience
A short time: one beer will rarely raise the blood alcohol level to more than 10 mg percent (0.1 grams percent), and we metabolize that amount in about one hour. So two hours or so after drinking the alcohol level should be zero. However, there are other tests, like ethyl glucuronide and ethyl sulfide, which test alcohol metabolites and they can remain positive for 1-2 days, depending on the test used.
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Last updated Nov 28, 2017

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