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Alcohol generally can't be detected in a blood test after 24 hours; however, this depends upon the sensitivity of the test and how much the person drank. Alcohol can be detected in urine 5 days after the last alcoholic beverage consumption.

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9y ago
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12y ago

4 days before.

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Q: If you have a blood test how many days beforehand should you stop drinking for it not to show up?
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