My Doctor said my liver has a problem.?

I Had a routine blood test last week, my Gp Just called to say the Liver (Gamma reading is 500)? Said it means ive been drinking heavy! He said it should be 80-100...I Hardly ever drink but did have a bottle of wine the night before would this cause the reading to be that high?
Update: He said a reading that high David, Indicates im drinking heavy over a long period, thats not correct, the wine was my 1st drink since december..I Just want to know if the wine the night before could make it go so high..
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