--as we talked about on the Vitamin/Mineral/Supplement thread, if you think you are gluten sensitive and do have a first degree celiac relative, you do need to get tested for celiac, which might well explain a lot of the symptoms and malabsoprtion.

The starting tests for this are assays for:

anti-gliadin IgG (the most sensitive test but least specific)
anti-gliadin IgA
anti-transglutaminase IgA (the most specific for frank celiac and most correlated with intestinal villious atrophy)
total IgA (if one has a hereditary underproduction of this antibody it tends to skew the other results in a negative direction).

There are also now somewhat more sensitive tests for deamidated anti-gliadin igA and IgG but these are not available everywhere, and there is some question as to just how much more sensitive they are.