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My daughter had RAST tests last year for a few foods that I had reason to believe she was allergic to (she already had peanut & tree nut diagnosis). When the results came back they were all positive. Her total IGE was just under 4000, after seeing some other people claim their levels were massively high at 400, why was this so high and what does it mean? She has eczema too. Her current allergies are; peanuts, tree nuts (tested and positive to brazil/hazelnut/almond/cashew), dairy, egg, raw tomato, sesame, cat dog & dust mite.

I know you can't obviously comment on her specific case but common reasons for high readings?

Thanks:)