My doctor said I have elevated liver enzymes and need to get another blood test.?

I'm away at school, 1,000 miles away from my doctor. I will be home in March but is it necessary for me to get another blood test before then? She told me not to worry because they were only slightly elevated, I looked up causes of elevated liver enzymes and I'm almost positive I cannot be a candidate for any of the reasons. Are these tests ever wrong or inconclusive?