I had one 16 oz. beer on Saturday at 10:00 pm if that... How long will this beer stay in my system. If I have a random UA at work on Monday (today) am I safe to say I will be OK.

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Originally Posted by kimmy01

I had one 16 oz. beer on Saturday at 10:00 pm if that........How long will this beer stay in my system. If I have a random UA at work on Monday (today) am I safe to say I will be OK.

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Small amounts of alcohol ingestion (one to three ounces) may still be detectable in the blood ten to twelve hours later, depending on the person. A habitual drinker’s blood and internal organs will "store" the alcohol from successive drinking sessions, and it takes much longer—sometimes up to a week—to eliminate enough alcohol from the system to pass a blood alcohol screening.

One beer two days ago - you should be OK.

I think you will be OK according to this link.

How Long Does Alcohol Stay in the Body?

Depending on your body weight and the amount of alcohol in the beer itself it is detectable in your system for about 12-15 hours. Most likely you won't be drunk or even feel affects from one beer but it will be measurable.