Here is the complete panel:
-Tissue Transglutaminase (tTG) IgA and (tTG) IgG
-Deamidated Gliadin Peptide (DGP) IgA and (DGP) IgG
-total serum IgA and IgG (control test)
-AGA IGA and AGA IgG - older and less reliable tests largely replace by the DGP tests
Personally, I tested positive on just the DGP IGa test when I was first diagnosed (had moderate to severe intestinal damage). My TTG tests were negative. My doctor has to order the DGP test and not the TTG tests when checking for antibodies during follow-up visits. If you do not know which tests were originally given, then ask for them all.
Yes, it can tell if you are reacting to gluten. That is a good place to start. I got sick in July 2015. My symptoms were not my Orignial symptoms. I was pretty sure I was glutened but I could figure out what I consumed that glutened me. So, I went for the bllod test. Sure enough, it was gluten! My antibodies were very high. I suspect two products which were labeled gluten free, but not certified. I am not going to consume them to test! So, I live without those two products. I did recover from my glutening, but it took me two months. I thought I was good about avoiding gluten. My husband had CD too, but he did not consume those two products. So he never got sick.
Standard protochol recommends annual testing to insure dietary compliance.