How do i find out if my child is allergic to food, specifically nuts without ingestion?

Several options: There are both blood tests and skin tests that can be done to see if possible allergies to specific foods/exposures. Would work in concert with your doc or allergist, as these tests can be a little misleading at times - just because something comes back "positive" does not always mean a true clinical allergy exists.Ingestion trials should only be done in a qualified allergist office- just in case!