How Continuous Glucose Monitors Work for Seniors with Diabetes
A continuous glucose monitor (CGM) tracks your blood sugar all day without finger sticks — learn how devices like Dexcom and Freestyle Libre work and what to expect.
Talk to your doctor about whether a CGM is right for you
~15sChoose a CGM system with your care team
~15sApply the sensor
~19sQuick Tip
Apply the sensor on a fresh area each time to prevent skin irritation. Rotate application sites with each new sensor.
Connect the sensor to your phone app
~15sSet up alerts and share access with family
~27sWarning
CGMs are not always 100% accurate and should not replace finger stick tests when making important dosing decisions — especially if the CGM reading does not match how you feel. Confirm with a finger stick when in doubt.
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A continuous glucose monitor (CGM) is a small wearable device that tracks your blood sugar level around the clock, sending readings to your phone or a small reader every few minutes. It replaces the need for constant finger stick tests.
Two of the most common CGM systems available in the US are:
Dexcom G7
: A small sensor the size of a quarter that sticks to the back of your arm or abdomen. Replaced every 10 days. Sends real-time glucose readings to your smartphone or Dexcom receiver. Alerts you when blood sugar goes too high or too low.
FreeStyle Libre 3
: Even smaller — about the size of two stacked pennies. Applied to the upper arm and worn for 14 days. Requires you to scan the sensor with your phone to get a reading (or it sends automatic readings to your phone via Bluetooth).
CGMs offer several advantages over traditional finger sticks: - See trends — whether blood sugar is rising or falling — not just a snapshot - Alerts when levels are out of range, even during sleep - Share readings with caregivers or family members who can monitor remotely - Less pain and inconvenience than multiple daily finger sticks
Cost and insurance
: Many Medicare Part B plans cover CGM supplies. Check with your doctor and insurance provider — a prescription is required. The sensor costs can range from $30 to $90 per month depending on the device and coverage.
Always work with your doctor when starting or adjusting to a CGM. The data it provides should be interpreted with medical guidance.
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