Not sure how allergy testing works, but if you have a full test where they test your for most things, isnt it possible you could show positive reaction to something you never knew you had. For example, you never eat shellfish but you test positive to shellfish allergy. Since it now not only documented but you actually know, wouldnt you have to disclose that information also. I have never eaten shellfish and I have no idea if I have an allergy to it so if someone asked me if I had an allergy to it , I could honestly say no. However, if I get tested and it comes up positive, then I would know