Hey, sorry I missed the in-between posts with the mayo link! I have a feeling that there must be some sort of scale between the two but I'm not able to research it right now, this is what I use as a reference for IgA results. I'm very interested in the mayo page and want to learn more about it, thanks for the link! When DS1 was tested, his IgA tTG was 100... so think it must be a matter of a decimal point or something like that!
http://www.arupconsult.com/Algorithms/CeliacDz.pdf
Also meant to say, I have a friend who's allergic to gluten, (also negative for celiac), her allergy was confirmed through allergy testing (at which time she found out she's also allergic to milk, eggs, tomatos, and a few other things... fun times!). I don't know much about allergy testing, but I do remember that each allergen had a "ping" rating, I think the scale was from 1-5, with 5 being the most allergenic. A test like that could help narrow down if she has an intolerance for gluten in a typical allergy sense, and how severe the intolerance is for determining how strict you need to be with cross-contamination, etc...
Love that flowchart! But it is confusing to me b/c my IgA shows 145 (DD14). How do you know how to intepret this? Surely 7.5 as you say is a decimal point missing or something?
At this point in the game, would you pursue anything else or just be gluten free and see how it goes?