Institut Fuer Diabetes-Technologie Surveillance Program

Inclusion Criteria: * Male or female, with type 1 diabetes, type 2 diabetes or subjects without diabetes * Signed informed consent form * Minimum age of 18 years * ubjects are legally competent and capable to understand character, meaning and consequences of the study. * If blood glucose values \< 80 mg/dl or \> 300 mg/dl shall be measured after short term alteration in insulin therapy: * Male or female with type 1 diabetes and intensified insulin therapy or insulin pump therapy. * Signature of subjects to document consent with these procedures on informed consent form. Exclusion Criteria: * Pregnancy or lactation period * Severe acute disease (at the study physician's discretion) * Severe chronic disease with potential risk during the test procedures (at the study physician's discretion) * Current constitution that compromises the subject's capability to participate in the study (at the study physician's discretion) * Being unable to give informed consent * \< 18 years * Legally incompetent * Being committed to an institution (e.g. psychiatric clinic) * Language barriers potentially compromising an adequate compliance with study procedures * Dependent on investigator or sponsor * If blood glucose values \< 80 mg/dl shall be measured after short term alteration in insulin therapy, subjects with type 1 diabetes, suffering from: * Coronary heart disease * Condition after myocardial infarction * Condition after cerebral events * Peripheral arterial occlusive disease * Hypoglycemia unawareness