Once you have donated blood, is it easier to get a high BAC?

I really don’t think it can make your ba increase because your body will still be absorbing the same amount of alcohol as it usually does. The blood to alcohol ratio will be a little off but it won’t make your system absorb more alcohol. already being slightly weak and lightheaded might change how you feel, like its affecting you more. You really should watch out for dehydration though, being that alcohol is a dia\uretic and you just gave blood. Drink lots of water

It would be easier, yes. BAC measures alcohol per blood volume, and blood volume is lower immediately after donation. The body quickly builds blood volume back up using ingested liquids to expand the plasma, but if those liquids include alcohol, then the alcohol concentration will necessarily be higher than if the blood were at full volume.

Thank you both.

@Harp That’s what I expected, but I thought since alcohol naturally dehydrates it would not be absorbed as much since its hydrophilic nature would have less of an affect due to lower water volume in the blood supply.

If a small person ingests the same amount of alcohol as a big person, the little guy will register a higher BAC, and this is purely because he has less blood to dilute the alcohol. After donating blood, you have the blood volume of a smaller person.

Thanks!

Are you preparing your act?
* Hic, sorry officer I donated blood and they gave me this rum cookie.

@markyy I wasn’t, but I like your thinking!