How long are xanax detectable in a urine test?

Your answer is wrong. That is not how half life is calculated. Most drugs should be undetectable in 5 half lives but may take longer. For example, If you take 1mg of Xanax in 26.9 you will have .5 mg detectable then you have to wait another 36.9 for it to go down to .25. It would be 134.5 hrs for it to drop to .03125 mg. I dont know the acceptable ng/l (nano grams per liter) for each specific UA test and if this would make it drop below the acceptable rate but if it does not you shoulbe fine by 7 half live. So to answer the original question you should be ok in 134.5 hr to 188.3 hrs (5.6 to 7.85 days). You still have some in your system in 7.85 days but it should not give a positive result.

Your answer is wrong. That is not how half life is calculated. Most drugs should be undetectable in 5 half lives but may take longer. For example, If you take 1mg of Xanax in 26.9 you will have .5 mg detectable then you have to wait another 26.9 for it to go down to .25. It would be 134.5 hrs for it to drop to .03125 mg. I dont know the acceptable ng/l (nano grams per liter) for each specific UA test and if this would make it drop below the acceptable rate but if it does not you shoulbe fine by 7 half live. So to answer the original question you should be ok in 134.5 hr to 188.3 hrs (5.6 to 7.85 days). You still have some in your system in 7.85 days but it should not give a positive result.

https://www.drugs.com/answers/how-long-are-xanax-detectable-in-a-urine-test-161337.html

I took 1 xanax on 25th and have a UA on the 27th will it show up i do not take them regularly

Xanax has the shortest half life. It's all life is anywhere between 10 to 12 hours. That's one half life. Divide by ( .5) five times and that's when it should supposedly be out. But drink water, all that, take some 5 hr energy. It's usually ends up around 5 days unless u take very little. If you're using insanely large amounts it could be longer.