GGT 49 for job interview?

Hello,  

I am a pilot for a small airline and I am interviewing for a job with a major airline.  Last week I had to complete my blood work to take to my interview.  All of my test results were entirely in the normal range except my GGT which was 49 (slightly high for women.)  I have since read that many things can affect your GGT - from Tylenol/Ibuprofen use to drinking too many diet sodas.  I know alcohol is the major contributor but I hadn't had any alcoholic drinks for a few weeks before the test (yet l drank loads of diet sodas and had a root canal - lots of Tylenol.)  My GP won't let me take the tests again before my interview (which is still another month from now) because he says my results are entirely normal. What do you think?  GGT seems to be easy to correct in a month by abstaining from all toxic chemicals.  Are my results "normal enough" to pass a rigorous Airline medical?   I'm 35, BMI 20, have one small child, and I am very healthy.