The stool test is supposed to be more accurate than the blood or biopsy, and with the stool test they can also do genetic testing for celiac disease. Enterolab is a place that does the stool testing. When I can, I'm going to get this testing done, just to make sure one way or the other and so I can say to family, yea or nay as per the test. With a family of doubters, just cutting gluten out of my diet and saying I feel better won't mean a thing.
Nice thing about the stool test, is if you have cut out gluten from your diet for a while (at least if it's been within 1-2 years), the test will still find if you have the antibodies in your intestines. With the blood test, you have to have recently eaten gluten, and may even have to be reacting badly for it to test positive, which is why a lot of times you may test negative with the blood test when you really are allergic to gluten. Blood test often only shows positive if you have full-blown celiac disease. A lot of folks aren't all the way to celiac disease but are just allergic and haven't yet done the extreme damage to their intestines ... but they will progress toward that damage if they don't avoid the gluten, so they need to know just as much as the celiac. That's where the stool test, I think, would be a great boon ... those of us who test negative with the blood test.
Blood test for me is negative, and I don't think I'm celiac, but do suspect I may be on my way. I suspect I may have a mild allergy to gluten that isn't showing up with the blood test. And I'm going to find out, hopefully before I ever do get bad enough to say it's celiac sprue.