Felix had his first round of allergy tests today. I thought it would be more comprehensive, but they only tested about 10 allergens. They did one for histamine as a control, and I remember eggs (yolk and whites), soybeans, corn, wheat, peanuts, and milk. Felix is allergic to peanuts and eggs - both yolk and whites.
[edit (thanks to Paige for the question): Brent is allergic to many things, but mildly, because he had desensitizing shots as a kid. What still gets him is peanuts, green beans (one of the things we have identified for Felix), soybeans, raw tomatoes, grasses like alfalfa (no sprouts, can't lay in the grass or mow the lawn), and he is very very allergic to rabbits. He does still have a mild allergy to cats as well. The reason I'm adding this is because we already know that Felix gets it from both sides of the family (most of my family has allergies, but I only have a very few).
Also, just an FYI, the first pic was taken about 30 seconds after the prick tests and you can already see the red spots forming. The second pic was taken only 2 or 3 minutes later and already the welts were obvious. I believe the top left welt was the histamine control.]
I was kind of hoping they would test for more things, since we have stayed away from peanuts (Brent is allergic) and we don't eat plain eggs very often (doc said eggs cooked into other things was probably okay, but no straight eggs) and he breaks out in hives at least once a month.
The doctor did say they could do more testing at about 2 years, so we're planning on going back in about 7 months. In the meantime, he said to just pay attention to the foods he eats and keep track of what causes hives and they'll add them to the list when we go back in.
Not as conclusive as I had hoped, but it's a start.