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happylandshoes · Mar 30, 2012, 02:32 PM

Ok... So I know similar questions have been asked here but id like some advice as to this particular situation. Last night between 10pm and 1am I had 4beers and 4shots. Today at 4pm I was given a urine etoh test by the state. I really don't want to wait till court to find out if I failed... I've heard its detectable in uour urine for only 1.4hrs for each drink... Is this true? Will I pass?

DrBill100 · Mar 30, 2012, 02:59 PM

Your estimate of elimination time is pretty close. On average your max clearance time would be in a range of 8-16 hours (based on a BAC of .16*, probably high). Most people metabolize nearer the higher end. In other words your estimate base would turn out at about 12 hours, pretty standard for EtOH registration.

By calculating your approx BAC at the time of last drink it is possible to more closely approximate. Here is a chart based on the Widmark formula: > BAC Calculation M/F

It is important to recognize that Urine Alcohol Content (UAC) is not the equivalent of BAC. UAC is lower during the absorptive phase (while you are drinking) and higher during elimination (after you have stopped drinking). Of course, any amount of EtOH remains in urine until you urinate.

If you can provide me with your gender, weight and how often you drink I could probably come a little closer but you are close with your noted figures.

* quickly estimated based on ave. between M/F, <.14 to <18 respectively, at 160 lbs.

happylandshoes · Mar 30, 2012, 04:43 PM

Male, 25yr, 170lbs, 2 times a week or so.
Thank you so much

happylandshoes · Mar 30, 2012, 04:44 PM

That thing says it was 1.1

DrBill100 · Mar 30, 2012, 05:19 PM

Originally Posted by happylandshoes

That thing says it was 1.1

Make that .112 (at 180 lbs-). My calculation based on gender and weight is BAC=.13 (rounded up) and not far off. Let's use mine because it's higher.

Now, based on your 1) rate of consumption and 2) history of drinking I would place your elimination rate within the range of .016-.020, although it could be higher (population average is .015).

In order to determine elimination time divide your approximate BAC by your approximate elimination rate (ER) and you arrive at an approximate elimination time of <9 hours. I would venture that is pretty close and follows forensic guidelines.

Lot of approximates but I have overestimated BAC and underestimated ER.

happylandshoes · Mar 30, 2012, 05:23 PM

Dr bill, I love you. Godbless your soul

DrBill100 · Mar 30, 2012, 05:53 PM

Originally Posted by happylandshoes

Dr bill, I love you. Godbless your soul

Nothing to do with me, my friend... that's established science.