In this clinical trial, accuracy evaluation of Bayer Contour XT blood glucose monitoring system and blood glucose monitoring systems from other companies across the overall tested glucose range will be performed.

Inclusion Criteria:

• 18 years of age or older
• Male or female subjects with type 1 or type 2 diabetes or healthy subjects
• For BG adjustment people with type 1 diabetes

Exclusion Criteria:

• Severe acute illness that, in the opinion of the Investigator, might pose additional risk to the patient
• Chronic illness that, in the opinion of the Investigator, might pose additional risk to the patient
• Current condition that, in the opinion of the Investigator, doesn't enable subject to participate in the study
• For BG adjustment people with type 1 diabetes without CHD, condition after myocardial infarction, PAOD, cerebral events or hypoglycaemia unawareness
• Legal incompetence or limited legal competence
• Age < 18 years
• Dependency from the sponsor or the clinical investigator
• Mental incapacity or language barriers precluding adequate compliance with the study procedures