GAD1 and latent autoimmune diabetes in adults: Although anti-GAD is by far the most common and most sensitive autoantibody and previous studies have reported that measuring other islet autoantibodies seems to add little value to anti-GAD in diagnosing LADA ( 1 , 6 - 8 ), we cannot exclude the possibility that analysis of other antibodies (e.g., islet antigen-2 antibody, insulin autoantibody, and zinc transporter 8) could contribute to the results, particularly among those with negative anti-GAD.