Why a Newly Diagnosed Person With Type 2 Diabetes Should Consider a Continuous Glucose Monitor (CGM)


Continuous glucose monitoring is not just for people with type 1 diabetes anymore! In fact, there are several reasons why a newly diagnosed person with type 2 should consider using a continuous glucose monitor (CGM).

According to the American Diabetes Association 2023 Standards of Care, real-time CGM should be offered to youth and adults with type 1 and type 2 diabetes on intensive-insulin therapy or insulin-pump therapy who are able to safely use the device.

What is a Continuous Glucose Monitor (CGM)?

Continuous Glucose Monitors—also known as CGMs—are wearable technology.

CGMs make it easier to track your blood-sugar fluctuations and trends. They do this by continuously measuring interstitial-fluid glucose levels.

Then, they report the collected data every 1-15 minutes.

Data collected by these systems are sent to a transmitter. Then, they are displayed in various devices.

Currently, four companies manufacture personal CGM devices in the United States:

By allowing for the ability to track dynamic blood-sugar fluctuations and trends over time, CGMs have revolutionized type-1-diabetes management.

  • CGMs allow for optimization of medical therapy and the prevention of dangerous events—like hypoglycemia.
  • CGMs continually monitor blood-sugar levels and give real-time updates through a device that is attached to your body.
  • CGMs sound alerts if your blood sugar is too low or high.
  • CGMs also provide a good way to monitor “time in range,” which is the amount of time you spend in the target blood-sugar range—between 70 and 180 mg/dL for most people.

What Are the Parts of a Continuous Glucose Monitor?

CGM systems are made up of three components:

  • The sensor (a small wire catheter that is inserted under the skin on your arm or abdomen).
  • A transmitter that attaches to the sensor, and
  • A handheld receiver and/or smartphone that displays your blood-sugar data in real time.

The Sensor

  • You place the sensor just under your skin—usually on your belly or arm.
  • Adhesive tape holds the sensor in place.
  • The sensor measures blood-sugar levels in the interstitial fluid under your skin
    You’ll usually need to change the sensor regularly based on the device—every 7 to 14 days.

The Transmitter

  • All CGM systems use a transmitter to wirelessly send the blood-sugar data from the sensor to a device where you can view it.
  • For some CGM systems, the transmitter is part of the disposable sensor.

The Handheld Receiver and/or Smartphone

  • Depending on the CGM system, blood-sugar data from the sensor is sent to either a handheld device called a receiver (similar to a cell phone), an app on your smartphone or an insulin pump.
  • You can download CGM data (real-time blood-sugar levels, trends and history) to a computer anytime. Some CGM systems will continuously send data.

Why is a Continuous Glucose Monitor Great for a Type 2’s Diabetes Self Management?

There are several reasons for a person with type 2 to consider a CGM.

Some are saying that CGMs will one day become the standard of care for type 2 diabetes—especially as the technology becomes easier to use and cost comes down.

Studies have shown the benefits of CGM on type-2 control.

In one study, researchers observed that people with type 2 diabetes who use insulin may see more benefits from the device than from a traditional blood-glucose monitor, for which they periodically prick their skin to test their blood sugar.

In another study,  it was found that people with type 2 diabetes who used insulin achieved a 0.24-point larger reduction in A1C with CGM than with traditional blood glucose monitors. CGM was also linked to a lower risk of hypoglycemia in this study.

CGMs are great for diabetes self management because they let you monitor the effects of the following on your blood-sugar levels:

  • Different foods
  • Times of day
  • Activity levels, and
  • Illness.

While self monitoring of blood sugar (i.e. finger-stick testing) provides a “snap-shot” of your of blood-sugar concentration—but is limited by the number of finger-sticks you are willing to perform each day—CGMs can report up to 288 blood-sugar readings per dayyes, you correctly read that.

Other ways that CGMs provide significant—potentially life-changing—benefits for diabetes management are that they:

  • Help avoid or delay serious, short- and long-term diabetes complications.
  • Potentially save money through improved diabetes management and fewer events, like hypoglycemia leading to emergencies.
  • Offer people with diabetes and their health care team more details about blood-sugar levels than traditional blood-glucose meters—giving the opportunity to analyze the data more precisely than ever before.
  • Provide biofeedback in real time, which allows people with diabetes to modify their dietary pattern or insulin dose based on trends, as directed by their health care provider. This may reduce your risk of hypoglycemia and hyperglycemia (high blood sugar).

Will I Ever Need to Do a Finger-stick Test If I Use a Continuous Glucose Monitor?

For some CGM models, you may need to do a finger-stick test with a standard blood-glucose monitor to calibrate the system and make sure the CGM readings are correct.

The Cleveland Clinic states that a finger-stick check may give you peace of mind if your CGM device shows rising or falling numbers—despite you feeling okay.

It can also provide answers if you don’t feel well—but the CGM says your blood-sugar levels are in target.

How Much Does a Continuous Glucose Monitor Cost?

CGM devices can be expensive.

More and more insurance providers cover them today, which may make the cost more affordable.

Your health insurance policy may only cover certain CGM devices.

Keep in mind that you’ll regularly need to replace sensors and possibly transmitters.

Check with your insurance provider to see what devices and supplies your plan covers.

Many providers and CGM companies have resources to help make CGM more affordable for those who need it.

This content was made possible by Abbott, a Founding Partner of Beyond Type 2.

Beyond Type 2 maintains editorial control over its content.

WRITTEN BY Daniel Trecroci, POSTED 03/25/24, UPDATED 03/25/24

Dan has written about diabetes for more than 20 years. He was one of Diabetes Health's first recruits, and throughout his 10 + years as Managing Editor he wrote/published thousands of articles and helped establish Diabetes Health as the premiere resource for people with diabetes. He later became the Content Manager for OneTouchGold—Johnson & Johnson/LifeScan’s official digital publication for its metering-technology customers. Under his leadership, OneTouchGold received the Web Marketing Association’s award for “Best Health & Wellness" web site. Dan has an also written for the Diabetes Research Institute, dLife, diaTribe, Healthline, CareDx, Pendulum Therapeutics, and Hero Bread.