Suzanne DiPiero wrote:

>   My question is how do you know what foods are causing the
> allergic reaction.   If your child is sick after a meal, how do you know which
> food caused it?  Are there tests which pediatricians or allergists perform to
> determine, for example, an allergy to nuts or shellfish?
>
>

Suzanne,
  Sometimes the reactions are very apparent as they are severe and immediate and
sometimes it will take a few reactions for you to pinpoint the item.  An
allergist can do a number of tests to determine allergies but none of them are
100%.  They go by a good background interview and the results of the tests.  My
son had skin prick testing and in our case it was very accurate.

Shirley