There are thousands of different glutens found in all of the varying grains. No lab definitively investigates these in depth. Cyrex labs is the most progressive lab to date. They still only test for IgA and IgG response. There are four other ways that the immune system can react.
Because so many of my patients react to grain in general and because glutens share similar structure, and because so many studies investigating other grains come back problematic, my advice is avoidance of grain.
All the best,