Hi Cheryl
I am an immunologist (among other things) but am not a health professional.
Your low serum IgA might be indicative of coeliac disease but it is not conclusive.
I suggest that you get your care team to check for IgA which is specific for gliadin - this can be diagnostic.
There is more info about this here;
https://labtestsonline.org/understan...ease/tab/test/ .
All the best.