A sensor is put into the skin (usually on the anterior abdominal wall), where it stays for the day. It is connected to the transmitter which is linked to a reader meter. The glucose sensor is a
microelectrode with a thin coating of glucose oxidase beneath several layers of biocompatible membrane. It continuously converts glucose from your interstitial fluid (liquid found between the cells
of the body) into an electronic signal, the strength of which is proportional to the amount of glucose present. Blood glucose and interstitial fluid glucose levels are essentially equal when blood
glucose is not changing rapidly. The monitor can measure approximately 300 times per. The monitor is carried on a belt, and stores continuous glucose data measured by the sensor at five-minute
intervals. CGMS requires at least 4 calibrations using blood glucose readings from a traditional meter. While most CGMS do not display glucose values real-time at present, the data is downloaded
into a computer and reports are printed,