How is the celiac disease diagnosed?

In the presence of symptoms that can be associated with the celiac disease, an initial diagnosis of gluten intolerance can often be obtained on the basis of blood tests alone. A definitive diagnosis, however, can be made only on the basis of an intestinal biopsy. In this procedure, a tissue sample from the small intestine is collected and then subjected to a histological exam, which can reveal possible atrophy of the intestinal villi.