2 doctors weighed in:

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

2 doctors weighed in
Dr. Alan Wartenberg
Addiction Medicine
1 doctor agrees

In brief: 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.

In brief: 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.
Dr. Alan Wartenberg
Dr. Alan Wartenberg
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