HNF1A and diabetes mellitus: The remaining 43 probands were tested in a pediatric clinic, a genetics clinic or a renal clinic; one patient had an HNF1A mutation, another a KCNJ11 mutation and nine had mutations in HNF1B. The focus of this study was genetic testing patterns and outcomes within the adult diabetes center, and the remainder of this report therefore focuses on the 36 probands tested in the adult diabetes clinic.