Evaluating System Accuracy and User Performance of Omnitest® Blood Glucose Monitoring Systems for Self-testing in Managing Diabetes Mellitus

Inclusion Criteria: * Male or female subjects with type 1 or type 2 diabetes, for the evaluation of System Accuracy also healthy subjects * Age ≥ 18 * Signed and dated informed consent form * For small modifications of the insulin doses to achieve certain blood glucose values (System Accuracy evaluation): Male or female subjects with diabetes mellitus type 1 with intensified insulin therapy (intensified conventional therapy - I.C.T.) or insulin pump therapy (continuous subcutaneous insulin infusion - C.S.I.I.) Exclusion Criteria: * Pregnancy or lactation period * Severe acute illness that, in the opinion of the investigating physician, might confound the results of the test or which could result in a risk to the subject caused by the test. * Severe chronic illness besides Diabetes mellitus as assessed by the investigating physician that might confound the results of the test or which could result in a risk to the subject caused by the test. * Mental incapacity or language barriers precluding adequate compliance with the test procedures * Legal incompetence or limited legal competence * Dependency from the Sponsor or the clinical Investigator (e.g. co-workers of the Sponsor or the clinical research centre) * For User Performance evaluation: Subjects having participated in a study with Omnitest® 5 before. * For System Accuracy evaluation: subjects intended to provide blood samples with glucose concentrations between 50 and 80 mg/dl must not have coronary heart disease, myocardial infarction in history, cerebral events in history, peripheral artery occlusive disease or impaired hypoglycaemia awareness * Anamnestically relevant amounts of interfering substances in the blood, following labelling in the instructions for use as reviewed and evaluated by a physician during screening.