In doing so, we had to find a middle ground where the definition might sometimes not give complete justice to a concept, but at the same time, it would also avoid oversimplification. As metrological definitions are sometimes rather difficult to understand for nonspecialists, the definitions are complemented by a description in an easier language where appropriate. This is also of importance in light of the revised International Organization for Standardization (ISO) guidelines. Subsequently, the aim of this article is to provide an inventory of key terms and to describe in brief the requirements for a sound evaluation of BG systems. For example, the term “accuracy” is sometimes used instead of “trueness.” 14, 15 We therefore propose that all people discussing this topic use a common language that is also used in other areas of laboratory diagnostics to avoid confusion. In most publications, terms are used with variable definitions. One annoying and rather problematic aspect with regard to all discussions about BG measurement and its related topics is the confusion with terms. What are the key terms to describe such a quality? In evaluating glucose measurement quality, which requirements need to be satisfied? This points to the need for high and reliable measurement quality. Self-monitoring of blood glucose is reported to support preventive strategies against acute and chronic complications of diabetes, to increase patients’ awareness of hypoglycemic symptoms, and therefore to trigger patient-initiated prevention of significant hypoglycemic episodes. Both of these determine the analytical performance of a given BG system. 1–10 A BG system is the combination of a BG meter and test strips. The use of blood glucose (BG) systems for self-monitoring of blood glucose (SMBG) both in insulin-treated and non-insulin-treated people with diabetes is supported by trials, reviews, meta-analyses, and guidelines.
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