a-DGP (deamidated gliadin) IgA / IgG is a laboratory test used to detect celiac disease – an autoimmune condition triggered by gluten intolerance. It measures antibodies against deamidated gliadin, a modified form of a gluten protein.
The IgA variant is the primary marker for most patients, while the IgG variant is especially useful in individuals with IgA deficiency or malabsorption disorders. The test helps doctors determine whether further gastrointestinal evaluation, such as a small intestine biopsy, is needed.