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Continuous Glucose Monitor (CGM) Definition


Updated August 02, 2011

Written or reviewed by a board-certified physician. See About.com's Medical Review Board.


A continuous glucose monitor (or CGM system) is a handheld personal monitoring device that uses wireless technology to collect glucose readings from a small sensor inserted under the skin. The sensor measures blood glucose levels in interstitial tissue fluid.

The system can display readings every one to five minutes in real time, and can be set to sound alarms if glucose levels go out of range, allowing immediate treatment. With the use of computer software, CGM data can be displayed in charts and graphs so that trends can be identified and blood glucose levels control improved.

CGMs are currently more expensive than traditional blood glucose monitors, but may be covered under medical insurance.


Continuous Glucose Monitor. Juvenile Diabetes Research Foundation International. Accessed: July 09, 2011. http://www.jdrf.org/index.cfm?page_id=106136

Continuous Glucose Monitoring. National Diabetes Information Clearinghouse. Accessed: July 09, 2011. http://diabetes.niddk.nih.gov/DM/pubs/glucosemonitor/

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