I was told by my allergist that allergies can pop up at anytime and also change. I am highly allergic to dust and mold. I was tested about two years ago. I never had allergies until I was pregnant with my second child. I would say they are accurate but keep in mind that if you are predisposed for allergies, then allergies for other things can pop up when you were in fact not allergic before. What does the doctor say about this reversal of allergies in your son??