In recent years, diabetes management has undergone a remarkable transformation with the rise in continuous glucose monitors (CGMs). These devices present patients with an easier way to maintain glycemic levels over the traditional finger prick approach. However, a deeper understanding of this category of devices, and what they are measuring, is critical for optimal diabetes management.

Traditional finger prick devices, called blood glucose monitors or BGMs, have been commercialized for decades and directly measure glucose from the blood capillaries in one’s finger. While they are very accurate, they only provide a single reading at a point in time, so it is not possible to know if the glucose is rising or falling and how rapidly. Alternatively, commercial CGM devices measure glucose with

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