The Anti-Gliadin IgG test is used to evaluate the presence of antibodies against gliadin, a protein found in gluten present in grains such as wheat and barley. This test is an important tool for diagnosing celiac disease (gluten sensitivity), as the presence of these antibodies indicates an abnormal immune response to gluten. The test is performed by collecting a blood sample to measure antibody levels, helping doctors determine whether dietary changes are needed or assess the condition of the digestive system.