CGM stands for Continuous Glucose Monitoring. It is a form of technology that allows you to track your glucose levels at regular intervals throughout the day and night. CGM systems work to sense, transmit, and receive your glucose data. The Dexcom G6 CGM System includes a glucose sensor, a transmitter, and a display device of your choice that displays glucose readings every 5 minutes. It also provides personalized alerts to notify you of your glucose highs and lows.