I have had these blood tests done (IGG) for food sensitivities. I know I feel much better eliminating the foods the tests showed I had a high level of IGG antibodies to. I figured after finding a doctor who would order the tests, this is something I could do on my own, which I did. I didn't care who accepted it but its nice to know that perhaps mainstream medicine will come around.
The tests showed I had high IGG levels to wheat and other related grains (but not barley or oats and my biopsy for celiac was negative), casein, corn syrup, egg white and to a lesser degree, egg yolk. When I eliminated these foods from my diet I noticed a major improvement- very few mouth ulcers (and they were a major problem) and most joint pain I had at the time disappeared completely. I do have foot tendinitis now which seems resistant, unless I have developed another sensitivity (I didn't have the tests repeated, its been 2+ years) When I give in and eat something with casein (milk protein) I always get a some degree of mouth ulcer.
I sure wish they'd figure this out- makes sense to me that if the gut lining is not the way it should be, it is not performing properly. It is our first line of defense.
10 years, many tests, 3 gi doctors, no diagnosis yet. Pentasa 1000mg 3x day