A Continuous Glucose Monitor (CGM) is a small sensor used to measure blood sugar levels in the body throughout the day. One sensor lasts for 14 days and needs to be scanned at least once every 8 hours to collect data.
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The sensor gets applied to the back of the upper arm. It translates the glucose measurements into dynamic data to show your interstitial glucose values on your smartphone. The sensor does not have other approved locations than the arm.
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The sensor should always be used according to its directions and labeling.