A Gliadin Antibody test is an investigation for Antibody IgA, used by the doctors to aid in diagnosing celiac diseases. The test is performed for antibody deficiency. This test took two types of antibodies – IgA and IgG - that develop in an individual suffering from celiac diseases. It tends to decrease rapidly in response to treatment for celiac issues. A gliadin antibody blood test is advisable for the people who show symptoms of the celiac disease. The celiac disease is a genetically susceptible immune-mediated condition in the mucosa of the small intestine. A final diagnosis should be confirmed by a doctor and may require an intestinal biopsy.