Aside: One issue that you'll come across for allergy tests is that they are pretty much useless. It's been a while, but if I recall correctly, the false positiv

Aside: One issue that you'll come across for allergy tests is that they are pretty much useless. It's been a while, but if I recall correctly, the false positive rate is ~10% and the false negative rate is ~45%. This is for both the skin prick and the IgG (IgE?) tests. If you run those numbers through the standard Bayesian analysis, you'll conclude that you pretty much get no information from these tests. But, really, go out and make sure they don't have some new test these days and figure out what those false positive and false negative rates are. Essentially, you're at the mercy of the allergists and the luck here. Make sure to find a good MD for help.