My daughter has a speech delay. I asked a friend when her speech delayed son (who is now fine) started talking and she said after she took him off gluten. We tried gluten free and 3 weeks later her speech exploded. We don't know if it's actually from the gluten or if it was a coincidence, but since we love a gluten free diet, we decided to just keep her gluten free. I have since learned a lot of people will have neurological, but not necessarily intestinal, problems from gluten.
I have been told that a lot of people with celiacs initially have problems with dairy. After they go off the gluten, it takes a year or so for their guts to heal to a level that they can sometimes start using dairy again.
Our daughter has had diarrhea since about 6 months of age. Long story short, last year we went to a pediatric gastroenterologist. Since our daughter was growing and doing well (except for speech delay which her biological family has) and because blood tests did not indicate celiacs, we did not do biopsy. GI doc said she probably had something called Toddler Diarrhea and she'd outgrow it by 4.
So, fastforward to this spring when we took her off gluten. Diarrhea continued. Another long story short: We went dairy free (and continued without sensitive foods.) Her poops got better. Today she got some half and half and had diarrhea again. We'll see what she's like the next couple of days.
It sure seems like it's dairy. The questions are: does she have celiacs that was affecting her speech or her bowels? If she does and it was effecting her bowels, is that why the dairy was bothering her? Or does gluten not bother her bowels but only dairy does? Ultimately, for us, for now, it doesn't matter. I LOVE being gluten free just because it has forced me to make healthier foods for our family. (As long as you avoid all the processed gluten free foods out there.) I also am a vegetarian who has wanted to go dairy free for years and this has forced me to do it. At this point our daughter has been gluten free long enough that we cannot have her tested without reintroducing gluten. We're not going to do that so it really doesn't matter. When she gets older we can re-evaluate all this.
Regarding your situation, trying him without wheat for a couple days will not effect the test. I don't know if you'll even see a change in his gut in that amount of time. Is there any chance it could be dairy related? A couple days without dairy might be more telling than a couple days without gluten.
Gluten is everywhere: Wheat (durum, semolina, kamut, spelt) rye, barley, and triticale. Oats are questionable so we just stay away from them. Then there's caramel color, malt, soy sauce, etc. Almost all fast food french fries have wheat coatings. (In and Out burger doesn't.) Here's a good quick start guide: http://www.livingwithout.com/resources/gluten_free.html
I went to a gluten free food fair here a few months back. The local celiac group was selling this book. http://www.amazon.com/gluten-syndrome-wheat-causing-harm/dp/0473124726/ref=sr_1_11?s=books&ie=UTF8&qid=1311226801&sr=1-11 I bought it, though I haven't read it yet.
You'll need to talk with this doctor about your husband's condition. If he is gluten sensitive, there is a HUGE world of gluten free living out there. As I said, I avoid all the gluten free products. They're just not that healthy and don't always taste very good. I have found lots of gluten free alternatives (and am now finding dairy free alternatives) that taste SOOOO yummy and are so healthy for you. Today I made gluten and dairy free cupcakes with almond flour and yummy whipped chocolate frosting. Almond flour is so healthy. And I'm really annoyed because my dogs seem to have eaten the almond flour crackers I made. I really like those and wanted some tonight. And for dinner tonight we had egg burritos made with homemade mung bean tortillas. Again, really yummy and really healthy. Check out www.elanaspantry.com for some great recipes. She uses a lot of almond flour and coconut flour. I'd also be willing to share some of the food ideas I've discovered. Feel free to pm me.