CGM is a way of measuring glucose levels throughout the day. A small sensor is inserted under the skin and checks the glucose levels in the interstitial (tissue) fluid. The sensor will work for three to seven days before needing to be changed (depending on the device). A transmitter connected to the senor sends glucose readings to a hand-held device or an insulin pump. Glucose readings may be reported every three to ten minutes. The CGM device can be downloaded by the user or a healthcare provider to create reports to determine what changes need to be made for optimal glycemic control.
The limitations of CGM By Christine McKinney, M.S., R.D., L.D.N., C.D.E.
http://health.yahoo.net/experts/livingwithdiabetes?tp=Diabetes
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