--an Anti-gliadin IgG assay (the one that was 261)?

The Anti-gliadin IgG is usually considered the most sensitive but least specific of the gluten assays. It is often the first to be abnormal in those with gluten sensitivity, but can be elevated in other conditions as well. (It's usually done with an anti-gliadin IgA, anti-transglutaminase IgA, and total IgA as well--the latter is done due to the fact that total IgA can be low in certain hereditary conditions and skew the other IgA results.)