There’s also yet another allele variant out there that tells your T-cells to react to oat protein as well as wheat protein. It’s kind of rare, so everybody with it is most likely a close relative of all the others.
Given the common contamination of oats with wheat, you would have to be very careful to isolate the oat protein to be certain. I haven't dusted off my lab skills in immunology and molecular biology in many years. It would be interesting to find a means of doing a lab test to detect some of these problems without having to subject a person to contact with the antigen.