Is Continuous Glucose Monitoring a Tool, an Intervention, or Both?

Studies that investigate use of diabetes technologies such as blood glucose monitoring (BGM) and continuous glucose monitoring (CGM) often report contradictory findings regarding efficacy and clinical utility. Whereas some studies of a given technology have shown no benefit, others have reported significant benefits. These incongruities derive from how the technology is viewed. Is it viewed as a tool, or is it an intervention? In this article, we discuss earlier studies that illustrate the contrast between use of BGM as a tool versus use as an intervention, compare and contrast the roles of BGM and CGM as tools and/or interventions in diabetes management, and suggest that CGM can function effectively as both.