Sorry, but it's not that simple. Celiacs, people with wheat allergies, and those with gluten intolerance are identified with blood tests and colonoscopies. It really is real.
Why are you posting this to me? I didn't write that. In fact, I protested the remark.
There are three levels of tests for Celiac Disease. The first level is genetic to see if you have the right genes. Approximately 1/3 of the population have the genetic make-up; however, there has to be a trigger, which isn't fully understood yet. Second, there is a blood test that shows the presence of specific antibodies; Celic Disease is an autoimmune disorder. The final step is biopsy of the small intestine, which occurs via endoscopy. That's how a GI doc will confirm the diagnosis.