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What is Continuous Glucose Monitoring?

More insight for better glucose control

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What is CGM?

Continuous glucose monitoring (CGM) is a powerful tool delivering information that patients with diabetes and their providers can use to help improve diabetes management.

CGM gives users a complete picture of their glucose level. Unlike a blood glucose meter which provides just a single reading with each fingerstick, CGM shows patients where their glucose is going and how fast it’s getting there.

Continuous Insight, Day & Night

CGM helps minimize the guesswork that comes from making decisions based solely on a number from a blood glucose meter reading.* CGM displays information about glucose direction and rate of change providing patients critical information to help with their diabetes management.

Browse CGM Basics Resources.

*If your glucose alerts and readings from the G6 do not match symptoms or expectations, use a blood glucose meter to make diabetes treatment decisions.

Fingersticks and CGM Comparison Graph

Wearing CGM

A CGM system contains three main components:

1. Sensor - measures interstitial glucose levels just underneath the skin.

2. Transmitter - this component sends data wirelessly to a display device.

3. Display Device - patient views their glucose data and trends here.

Dexcom CGM also provides customizable alerts to warn the wearer of approaching glucose highs and lows.

Take a closer look at the Dexcom G6.

Dexcom Personal CGM

The Benefits of CGM

A1C Reduction

RT-CGM has proven to be the best outpatient glycemic management system for reducing A1C.1 Patients with type 1 diabetes experience an average reduction of 1.3%†2 and 1.4%‡3 in type 2 patients.

Reduced Hypoglycemia

Hypoglycemia presents a significant risk to the health and safety of your patients. Not only can CGM use reduce A1C, numerous studies have shown it can also decrease time spent in hypoglycemia.2,4,5

Active Monitoring at Night

CGM systems are equipped with alerts that can warn users of approaching lows and highs. These warnings can provide an added layer of protection, giving your patients more peace of mind.

Real Time Means Peace of Mind

Whether cognizant of the process or not, every day, your patients are making decisions about their diabetes - not only when they sit down to eat - but when they go for a run, present at a meeting, drive a car, or go to bed. With real-time CGM, these decisions are not made blind, but with the knowledge of what their glucose level is and where it’s headed. Dexcom CGM’s customizable alerts will notify users if glucose levels go above or below their target range during life’s everyday activities.

The Dexcom G6 CGM System

Providing Glucose Clarity 24/7

In this 2-minute video, see the differences between self-monitoring of blood glucose (SMBG) and CGM. Discover how CGM clarifies the daily and hourly decisions of people with diabetes, and helps empower them to sustain diabetes control.

Watch our video to learn about CGM vs SMBG.

Browse through more CGM videos.


Get the Most Out of Patient Visits at the Clinic

With easy data sharing, providers can access CGM reports that show patterns, trends or specific data for each patient. Learn more about Dexcom CLARITY and how you can incorporate patient CGM data at the clinic.

Data Analysis - Downloadable Reports

*If your glucose alerts and readings from the G6 do not match symptoms or expectations, use a blood glucose meter to make diabetes treatment decisions.
†Type 1 participants with a baseline A1C of ≥ 8.5%
‡Type 2 participants with a baseline A1C ≥ 9.0%
1 Juvenile Diabetes Research Foundation Continuous Glucose Monitoring Study Group. Continuous Glucose Monitoring and Intensive Treatment of Type 1 Diabetes, N Engl J Med. 2008: 359(14); 1464-1476.
2 Beck RW, Riddlesworth T, Ruedy K, et al. Effect of Continuous Glucose Monitoring on Glycemic Control in Adults With Type 1 Diabetes Using Insulin Injections: The DIAMOND Randomized Clinical Trial. JAMA. 2017;317(4):371–378. doi:10.1001/jama.2016.19975. 
3 Beck RW, Riddlesworth TD, Ruedy K, Ahmann A, Haller S, Kruger D, et al. Continuous Glucose Monitoring Versus Usual Care in Patients With Type 2 Diabetes Receiving Multiple Daily Insulin Injections: A Randomized Trial. Ann Intern Med. 2017;167:365–374. doi: 10.7326/M16-2855
4 Lind M, Polonsky W, Hirsch IB, et al. Continuous Glucose Monitoring vs Conventional Therapy for Glycemic Control in Adults With Type 1 Diabetes Treated With Multiple Daily Insulin Injections: The GOLD Randomised Clinical Trial. JAMA. 2017;317(4):379-387.
5 Šoupal J, Petruželková L, Flekač M et al. Comparison of Different Treatment Modalities for Type 1 Diabetes, Including Sensor-Augmented Insulin Regimens, in 52 Weeks of Follow-Up: A COMISAIR Study. Diabetes Technology & Therapeutics. 2016;18(9):532-538. 

Contact Dexcom

If you are a clinician and want to learn more about Dexcom’s Continuous Glucose Monitoring Systems, please fill out the form and a Dexcom representative will contact you.

If you are a Dexcom User or Patient, please contact Dexcom here.

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