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- Continuous glucose monitors (CGM) are devices that can measure interstitial glucose every several minutes to inform real-time glycemic values and trends to the user.
- CGM devices consist of three parts, a sensor, transmitter, and receiver. The sensor is inserted under the skin to check glucose levels in the interstitial fluid. The sensor stays in place for several days to a week after which it must be replaced.
- The user must calibrate CGM by checking blood samples at least twice a day using a glucose meter.
- CGM devices must be removed before magnetic resonance imaging or computed tomography, as they can be damaged from these radiological studies.
- Use of acetaminophen while wearing the sensor from DexCom may falsely raise the sensor glucose readings.
- CGM devices are safe to be worn on U.S. commercial airlines. For Medtronic Guardian CGM, the transmitter should be disconnected from the sensor while on an aircraft.