An intermittently scanned CGM system requires the user to scan the device to obtain the glucose data. It uses two main components: a combined glucose sensor/transmitter (usually inserted in the upper arm) and a separate touchscreen reader device. The sensor continuously samples and measures glucose levels, generates a new glucose value every minute, and records the reading every 15 minutes for up to 10 to 14 days, depending on the model.
Pros:
- The main advantage is that this system is convenient and easy to use. The sensor is small and painless to apply, comfortable to wear, and easy to use. Also, a patient can scan the transmitter through any clothes, which is convenient and discreet.
- Eliminates finger sticks. Like the real-time CGMs, some intermittently scanned devices can be used without requiring daily finger stick calibrations.
- Affordable and less expensive than real-time CGMs. Most insurers and Medicare cover most devices.
- Data can be shared in real time among family, friends, caregivers, or health care providers.
Cons:
- One main disadvantage is that most intermittently scanned CGMs do not have alerts to warn about current or upcoming glucose problems. Typically, there is no chime to alert a patient about a low blood glucose level, especially overnight.
- It is more difficult to remember when to take a reading, especially if a person is busy or distracted or at night.
- More time may be necessary to warm up the system. When a new sensor is inserted, the device may take up to 12 hours to show any glucose data.
- Recalibration of the sensor may take more work to perform.
