You may have celiac. The usual test for celiac disease is the detection of IgA against gliadin. Some people don't make very much or any IgA (about 1 in 400 have this finding). In the absence of IgA persons with celiac disease make igg antibodies against gliadin. The diagnosis of celiac disease is generally made through endoscopy by the appearance of the small intestine with confirmation on biopsy.