Dr. Bill I am seeking help! I was given an ETG test and it came back positive, however I have abstained form alcohol. I had a bilio-pancreatic diversion and duodenal switch (ie gastric bypass) in 2003 and feel that this change in my digestive system may have a hand in the skewed result. I am seeking any guidance as to how my surgery could effect how the ethanol that I come into contact with on a daily basis.