Inclusion Criteria:  Male or female patients with clinical indication for blood glucose testing Signed form of consent Minimum age of 18 years Subjects are legally competent and capable to understand character, meaning and consequences of the study  Exclusion Criteria:  Pregnancy or lactation Severe acute disease (at study physician's discretion) Acute or chronic diseases with inherent risk of aggravation by the procedure (at study physician's discretion) Current constitution that does not allow participating in the study (e.g. hematocrit out of the devices's specifications, medication known to influence blood glucose measurements; Appendix A of ISO 15197) Being unable to give informed consent Age younger than 18 years Legally incompetent