The Gliadin IgG antibody test is also a blood test used to help diagnose celiac disease. Like the Gliadin IgA antibody test, it measures the levels of antibodies produced by the immune system in response to gluten ingestion. However, the Gliadin IgG antibodies are a different type of antibody than the IgA antibodies. Some people with celiac disease may produce Gliadin IgG antibodies instead of IgA antibodies, or they may produce both types. Therefore, the Gliadin IgG antibody test can be a useful complement to the IgA antibody test in helping to diagnose celiac disease. However, like the IgA antibody test, a positive Gliadin IgG result is not definitive and must be confirmed with additional tests and a biopsy. The Gliadin IgG antibody test is just one tool that doctors can use to diagnose celiac disease and help patients manage their condition.