--or immunoglobulin E testing is to measure her overall allergic tendency. Immunoglobulin E is the substance that causes most allergic reactions when they occur.

Don't have much to add to what Annie3B said--she's quite on target--but I also include this source, linked right through Neurotalk here, as the most comprehensive database of medical and other information yet collected about celiac, gluten, and related topics:

https://sites.google.com/site/jccglutenfree/

This was put together by our own Cara, jccglutenfree, whose family story is fascinating, and I give her credit for almost singlehandedly making people more aware of this condition in the early days of the Internet (she's been adding to the File for going on two decades, and there is stuff there it's hard to find anywhere else).

By the way, there are subtle signs of possible beginning malabsorption in the other lab results--her calcium level is relatively low for a young child, and the low BUN could point to not absorbing quite enough protein (blood urea nitrogen is usually a little higher than that) for example. It wouldn't be a bad idea to get her B12 and D levels tested. But, of course, the biggest thing is getting her on a gluten-free diet.