Thank so much for your insight and quick response!

I should have mentioned the specific tests done previously:

tTG IgA result: 1 (Ref: negative 0-3)
Immunoglobulin A Qn, Serum 115 (ref 70-400)

Yes, definitive results would always be nicer, although I guess the genetics and the symptoms should count for something....

Thanks again for your help!