My 3-year-old son has been waking up with hives occasionally for over 5 months now. We ve taken him to an allergist as well as regular visits to his pediatrician. No cause has been determined, but in doing his blood work, his AST liver enzyme continues to come back as slightly elevated. It has been at 73, 62 and lastly 63. The pediatrician has advised us to wait 6 to 9 months to repeat the test and see if the AST enzyme is back in range. Waiting that long makes me nervous and I m looking for some reassurance that this is not reasons to persue the situation immediately. Also, is more likely that the hives are a cause or reaction to what is contributing to the elevated liver enzyme? Thank you for your time.