you don't have diarrhea, just constipation? That still can be a sign. I had diarrhea, bad...but my daughters, both of them had severe constipation. The one with the less severe symptoms tested high on the blood test and had a lot of damage in the endoscopy. The one with the worse stomach problems tested fine on both, but has the gene. They told me to test her every year. I hated seeing her in pain, so I pulled her off gluten completely. It is never good to stop gluten before testing. I did and my diagnosis took a while. My daughters odds of having a possitive test result in the future are pretty high...I couldn't take her screaming in pain on the toilet, and not being able to walk down the street bc the pain was so intense. That was it, no more. I looked at her in the hotel room one day, in pain and said, that's it! She agreed.
Another thing my other daughter had, was warts. Those went away after her dx and going gluten-free. Warts are an infection that the celiacs allowed to take part of her body. When the gluten was removed, her body was able to fight off the warts. Not many people talk about that...but I did read it somewhere, and then I watched it in my own daughter.