CLINICAL TRIAL / NCT01795144

Monogenic Diabetes Subjects: Inclusion Criteria: - Diagnosis of monogenic diabetes - Previously participated in US Neonatal Diabetes Registry (IRB 15617B) or Genetics of diabetes mellitus (IRB 6858) - Age: 18 years + Exclusion Criteria: - Pregnancy - Acute medical illness or chronic conditions including: cardiac failure, renal insufficiency (estimated glomerular filtration rate <50 ml/min), hepatic insufficiency (known cirrhosis or hepatitis), chronic obstructive pulmonary disease, gastrointestinal disorders causing malabsorption, anemia (Hct < 36%), or uncontrolled hypertension Healthy Controls: Inclusion Criteria: - Good general health - Stable weight for 6 months - Age: 18 years + Exclusion Criteria: - Pregnancy - Acute medical illness or chronic conditions including: cardiac failure, renal insufficiency (estimated glomerular filtration rate <50 ml/min), hepatic insufficiency (known cirrhosis or hepatitis), chronic obstructive pulmonary disease, gastrointestinal disorders causing malabsorption, anemia (Hct < 36%), or uncontrolled hypertension