I don't think gas and fussiness show up as an IgE allergy. I had DS tested twice (once at 8 months and once when he was 7) and nothing showed up, but he's intolerant to milk, soy, cocoa, and white potatoes, and I think it's now extended to all legumes. I had DD tested once, and nothing showed up for her and she has lots of intolerances (gas, fussiness, screaming all night, eczema, cradle cap, diarrhea, etc.). If you get a negative test result, are you going to just feed your DS everything and not do anything? I guess I don't have much confidence in the tests except when they're anaphylactic allergies. I have heard so many stories of people getting tested and showing they were positive for things they've never reacted to, and negative to things they've always reacted to. I think an elimination-challenge diet is much more effective.
Kathy, mother of 3, wife of 1. My new recipe blog:
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longer searchable by allergen, but at least it doesn't have a virus!)