thank you for the insight  Thank a small elevation can be due to this or is it more likely to be cross contamination ? 

It could be. Think I'll just have to avoid that cereal. Thank for suggestion..

"Similar proteins to the gliadin found in wheat exist as secalin in rye, hordein in barley, and avenins in oats, and are collectively referred to as 'gluten'. The gluten found in all of these grains has been identified as the component capable of triggering the immune-mediated disorder, celiac disease." https://pubmed.ncbi.nlm.nih.gov/28244676/   "However, it is necessary to consider that oats include many varieties, containing various amino acid sequences and showing different immunoreactivities associated with toxic prolamins. As a result, several studies have shown that the immunogenicity of oats varies depending on the cultivar consumed." https://pubmed.ncbi.nlm.nih.gov/26557006/   "In 2007, a study showed that all the varieties of oats tested were immunogenic, with Lampton and Ava avenins inducing lymphocyte activation similar to that activated by wheat gliadin, while Astra and Nave avenins showed less immunogenicity, but still with a measurable effect.6 In 2011, a study showed that there is a wide range of variation of potential immunotoxicity of oat cultivars. It concluded some oat strains are more toxic than others." https://glutenfreeworks.com/blog/2011/06/20/why-oats-should-be-excluded-from-the-gluten-free-diet/   Silano M, Benedetto RD, Maialetti F, et al. Avenins from different cultivars of oats elicit response by coeliac peripheral lymphocytes. Scand J Gastroenterol 2007 Jun 8;:1-4 Comino I, Real A, Lorenzo L, et al. Diversity in oat potential immunogenicity: basis for the selection of oat varieties with no toxicity in coeliac disease. February 2011.

I have read research indicating differing reactions to various oat cultivars, however, nothing suggesting that some contain gluten - do you have a source for that?

For those of you who have had celiac for a long time what do your IGA and TTG IGA Levels usually show on follow up blood work ?