If you are a heavy drinker and then think bollocks I will stop drinking because I have a test coming up it actually makes it worse. This is because the liver once you stop abusing it starts to heal and it dumps all its toxins stored in it to deal with processing the booze.
We recently had a new hire do a pre-employment medical, he was initially told that his readings were high, then a week later he was told that because his liver had responded so rapidly to his not drinking, that this indicated he was an excessive drinker. His employment offer was rescinded.
Mutt