IgG ELISA Tests

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I had one done and it found 0 significant IgG except for baker's yeast, which was a "3." Everything else was "1" or lower. Gluten and casein were both "1" which is supposedly "insignificant" according to my doctor. Most things checked in at 0. A separate test for celiac disease (which is unrelated to IgG) came up negative as well.

I did a search for this test, and it has been criticized as giving false positives for food allergies. But could it also give false negatives?

I strongly suspect I do not have any food allergies or intolerance except maybe yeast, so I will avoid baked goods, which I don't eat much anyway. I do lower GI pain after eating certain foods, but the doctor suggested candida or bad bacteria balance instead of food intolerance.

Also, the doctor, who is used to dealing with autistic children, said "if you had autism before, you've clearly grown out of it. Maybe you grew out of food allergies and grew out of autism along with it."

I don't know whether this was just ignorant or insightful since this doctor does deal extensively with GI issues and food allergies in autistic children.

Unfortunately a lot of these tests are not 100%.

I know that the test for celiac disease has a false negative rate of 30% with blood tests and with biopsies. It's higher if you haven't been eating the set amount of gluten every day for the last 6 months which is needed to make the test accurate.

As for allergies, intolerances and others: it entirely depends on if they are testing IgA, IgG or IgE. Some will only test one. Some will test all three. Some will do it by hair samples, others will do it by blood samples. It's currently unknown whether you need to be a certain amount of the food daily for a set amount of time to even know if the tests will be accurate (so far it appears you don't for allergies, but you do for intolerances or autoimmune related reactions that aren't allergies). But yes it is possible to have false negatives which I hear are fairly frequent, and occasionally, false positives with them.

Yeast is in practically every prepared food. It often isn't listed as such but if a product says "natural flavor" you can bet that it is actually autolyzed yeast. It can be listed under several different names. If yeast is your problem you may be eating it without knowing it.