A member asked:

I'm having a hair strand test to see how long i have been abstinent. ihavent drank for 5 weeks how far back does it go?

A doctor has provided 1 answer

I don't know what...: ...lab is used in the UK, but the 2 major labs in the U.S. have a detection time for by-products in hair samples of amphetamines, ecstacy, marijuana, cocaine, opiates & PCP from 10 to 90 days. The detection "window" for the metabolite of alcohol (ethyl glucoronide) is similar. However, this metabolite might not show up if you're a light or occasional user. Good luck!

Answered 8/13/2015

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