Study Design Conducted across 4 diabetes clinical centers in USA −N=95 adults with Type 1 or Type 2 diabetes using insulin therapy −21.1% subjects: HbA1c > 8.5% (69 mmol/mol) −32.6% subjects: HbA1c < 7% (53 mmol/mol) Subjects were asked to: −Attend 4 in-clinic 7 hour YSI sessions on days 1, 6, 11 & 14. Plasma venous samples were tested on YSI every 15 minutes −Fast for 4 to 8 hours prior to in-clinic sessions −Perform at least 8 capillary BG tests daily using Reader test strip port −Scan the sensor following each BG test