A device is provided for determining blood glucose characteristics including a display configured for presenting a graphical representation of a plurality of measurements of blood glucose values, wherein the graphical representation comprises a trend indicator indicating an approximate value trend in the sensed blood glucose value over a recent series of measurements, based on graphical segments having different graphical styles assigned to different ranges of sensed blood glucose values to indicate a transition from a first range to a second range of sensed blood glucose values. An associated method for operating a device for determining blood glucose characteristics is also provided.