Establishing Ambulatory Glucose Profiles for People Without Diabetes Using CGM Data

Inclusion Criteria: * Male or female * Within normal range for two hour OGTT glucose level (\<140 mg/dl) * Within normal range for fasting glucose level (\<100 mg/dl) * Within normal range for total insulin level as measured by radioimmunoassay * BMI \<30kg/m2 * Age 21-75 years of age, inclusive (15 subjects in the 21-49 years of age group, 15 subjects in the 50-75 years of age group) * Willing to give informed consent * Capable of following the protocol and instructions of study staff * Available for scheduled visits * Access to telephone communications Exclusion Criteria: * Under 21 years of age or over 75 years of age * Abnormal OGTT * Previous history of diabetes * Outside of normal insulin range * BMI \> 30kg/m2 * Unable to follow protocol * Unable to read and write in English * Skin abnormalities at insertion sites * Allergy to adhesives * Any concomitant medical condition that would likely affect the evaluation of device performance * Taken prednisone or cortisone medications in the previous 30 days * Blood transfusion within the past 90 days * Blood donation within the past 30 days * Metabolic syndrome (NCEP ATP III guidelines) * Any medical condition that would affect glucose (per investigator decision)