Most recently, Ahlqvist et al. developed a new framework for characterizing adult onset diabetes based on six clinical metrics measured in Scandinavian individuals at the time of diabetes diagnosis: glutamic acid decarboxylase (GAD) antibody, age, body mass index (BMI), hemoglobin A1c, homeostatic model assessments of beta cell function (HOMA2-B), and insulin resistance (HOMA2-IR) [8••]. Here, GAD1 is linked to type 2 diabetes mellitus.