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Continuous Glucose Monitoring Systems...


A Continuous glucose monitor is a small device warn under the skin that uses interstitial fluid to monitor blood glucose levels. It then transmits readings to a receiver and allows a person with diabetes to have a guide to what blood glucose levels may be at a given time and whether they are expected to rise or fall in the near future.


What is the difference between traditional glucose testing and using a Continuous Glucose Monitor?


Glucometers are portable devices that read glucose levels from a blood sample that is placed on a tiny test strip. Test strips are discarded after a single use.  Some meters store a limited number of glucose results in memory. The results can be downloaded into a computer.


A glucose sensor is a tiny electrode that is inserted under a patient’s skin (subcutaneous tissue) and continuously records glucose levels around the clock. The sensor is worn for between three to seven days before it is discarded and replaced by the patient.  Glucose readings are transmitted to a monitor or insulin pump where the values are displayed. Trend reports and charts can be viewed after data is downloaded to a computer.


posted with permission from 2006 Medtronic MiniMed, Inc.



decom G5 Dexcom G5®


The Dexcom® G5 shows where your blood glucose is, where it’s going, and how fast it’s getting there. This Continous Glucose Monitor only requires calibration every 12 hours (if you feel that the CGM reading is off, always refer back to your glucometer reading however).


The Dexcom G5® Mobile is approved for adults and children 2 years and older. It uses Bluetooth technology to send information from the transmitter to your Andriod or Apple mobile device.


Provides real-time glucose values that can be used to make treatment decisions.


Text messages and alerts for highs and lows can be sent to your device as well as can be shared with loved ones for added protection.


Tranmitters are warranteed for 3 months from the time they are shipped.


Sensors are to be changed out after 7 days.

CGMEnlite™ glucose sensor and MiniLink™ transmitter


This CGM system also offers real-time glucose monitoring. This system wirelessly sends glucose readings to the insulin pump every 5 minutes. 

Sensors should be changed every 6 days.    


Comparison Chart...


Dexcom G5® 

Medtronic Enlite System in 630G

Availability USA and Canada USA and Canada
Communicates with Insulin Pump Transmits to OmniPod® and
Tandem® insulin pumps 
630G and 670G 
Percentage of false alerts  30.2%  43% 
Sensor Life 7 days (some users continue to find
accuracy well into the second
and even the 3rd week of use)
6 days
Angle of insertion 45 degree 45 degree
Start up initialization time 2 hours 40-120 minutes
Calibration First calibration after 2 hr warm up
needs 2 finger sticks; after that its
only 1 each 12 hours.
Do not calibrate using alternate site
Calibrate after 15 minutes and 3-4 times per day. 
Sends data to mobile devices  Yes, can send to Android or Apple device, also can be shared with friends/family  Yes,MiniMed Connect shares data with friends and allows you to view from CGM trends from your mobile device but does not replace the pump view
Displays directional trends Yes Yes
Displays rate of change yes yes
Vibrate, Alarm or Both Both
If using on a mobile device that is set on vibrate or "Do not disturb", Dexcom® will override this and gradually increase its
alarm volume until the alarm is
Vibrate, escalating alarm, or both
Transmitter Water Resistant yes
The receiver is not.
Range of sensor to transmitter 20 feet 6 feet
Warranty 3 months on transmitter 6 months on transmitter, 4 years on pump



CGM Comparison Studies:

Comparison of Two Continuous Glucose Monitoring Systems, Dexcom G4 Platinum and Medtronic Paradigm Veo Enlite System, at Rest and During Exercise, June 2106  


18 month comparison of Medtronic Enlite and Dexcom4 


Flash Meter

Flash monitoring systems do not provide the same continuous readings as found in Continuous Glucose Monitors.  Readings are only delivered when the reader is passed over the receiver. 

There are still many benefits to this system for users however.


FreeStyle Libre


The Libre is not a continuous glucose monitor but is consider to be a flash meter.  It requires no calibration and measures the glucose in interstitial fluid through a small circular sensor worn on the body. A scanner/reader shows the current glucose readings as well as whether blood sugar levels are trending upwards or down.


The Libre does not currently work in conjuction with any insulin pump. -





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