The glycaemic compass: Time in range.

This communication describes a contemporary model of diabetes monitoring and therapy assessment, the Time-in-range'(TIR), as the Glycaemic compass. The term 'compass' is apt, as it reflects the dynamic nature of TIR concept. TIR can be used not only as a target, but also as a tool to achieve this target, to explain the importance of good control, and to facilitate changes in therapeutic approach. The theranostic nature of TIR allows it to be termed as a compass for glycaemic control.