GAD1 and diabetes mellitus: There is limited data on (1) the presence of GAD antibodies in asymptomatic individuals, (2) the sensitivity and specificity of GAD antibody assays in various contexts, (3) potential false positives, and (4) the dynamics of antibody levels over the disease course or recovery phase. Of note, GAD antibody is also associated with diabetes mellitus, but that is beyond the scope of this article.