Welcome to the forum, @Izelle! Normally, the diagnosis of celiac disease involves two stages.  The first stage involves a simple blood test that looks for antibodies that are pretty specific to celiac disease. Celiac disease is an autoimmune disorder that attacks the lining of the small bowel which produces antibodies that can be detected in the blood with tests specifically designed for this purpose. There are a number of these tests that can be run. Some are more specific for celiac disease and thus more reliable than others. The two most common antibody tests ordered by physicians when diagnosing celiac disease are the "total IGA" and the "tTG-IGA" test. At least these two should always be...