Which is Not a Type of Continuous Patient Monitoring Device

When researching CGMs (Continuous Glucose Monitor) it can be difficult to know which device to choose. In this article we'll compare the manufacturers of four of the most popular CGM devices on the market today. Then, we'll go through the individual CGM devices' features, pros and cons of each, and how to choose between them.

The first thing you should do before deciding on a specific type of continuous glucose monitor is consult your healthcare provider and insurance company. Your physician may have a specific type of CGM in mind for your situation, while your insurance company may only cover a specific CGM model.

After consulting your physician and insurance company, you're ready to read on.

CGM Manufacturers

Let's review the basic components that CGM systems share:

  • Sensor: a small wire inserted under your skin on the stomach or back of the arm and is responsible for measuring the blood glucose levels every minute or five minutes
  • Transmitter: a wireless component of the sensor and it sends the blood glucose levels to the receiver, reader, or a smart phone app
  • Receiver: also called reader, is a separate device that displays the data from the sensor

The way these components work varies among the different manufacturers. Most features on each manufacturer's CGM are similar. However, some features may be more important to you then others, so it is worth to do a quick review of the four main CGM brands.

Abbott

Abbott Laboratories has the longest history of these four companies and was founded in 1888. They are a widely recognized name in industries such as diagnostics, medical devices, nutrition and branded/generic pharmaceuticals. Their CGM was approved by the FDA in 2008. Abbott does not specialize in CGMs or diabetes-related products. However, Abbott's FreeStyle Libre is a major trendsetter. The FreeStyle Libre 2 was released in 2020.

Dexcom

Dexcom was founded in 1999 and in 2006 was the second company to have its CGM approved by the FDA. Dexcom is headquartered in San Diego, CA and specializes in developing and creating continuous glucose monitoring systems. Dexcom has partnerships with insulin pump manufacturers Insulet Corporation, which offer the Omnipod DASH® Insulin Management System and Tandem Diabetes Care, which offer the Tandem® t:slim X2® Insulin Pump. For those of you who use an insulin pump, this makes for easy connections to your pumps. US MED offers the Dexcom G6 continuous glucose monitor.

Eversense

The newest CGM brand is Eversense which is created by Senseonics. Their 90-day implantable CGM was approved by the FDA in 2018. Their 180-day Eversense XL was approved for use in Europe in 2017. Like Dexcom, Eversense specializes in diabetes management systems.

Update: September 2020

On March 26, 2020 Eversense halted sales to new customers and is currently only servicing existing customers.

Medtronic

Medtronic was founded in 1949 and was the first company to gain FDA approval for CGM devices in 2001. Though not focused specifically on diabetes care, Medtronic's Guardian Sensors are widely used.

Comparing CGM Systems

Now we are going to compare the five types of CGM systems on the market by evaluating their features. These systems have been manufactured by the suppliers listed above and are all high-quality CGM devices. Read through the pros and cons to see which type of system is right for you.

G6

Dexcom's CGMs G5 Mobile and G6 are approved for anyone over two. The G6 does not need fingerstick calibration while the G5 does need calibration. The sensor on the G5 lasts for seven days and the sensor for the G6 lasts for ten days. Another benefit of the G6 is that it can even take accurate readings when you have ingested acetaminophen.

Despite their differences, all of the Dexcom CGMs use the continuous tracking method, which continuously monitors your glucose levels. Alarms will sound on these devices when your blood glucose has reached thresholds that are either too high or too low.

PROS CONS
Continuous monitoring and alarm system keeps you informed. Sensors must be replaced every 10 days.
Data is sent directly to your receiver or Smartphone app. Sensors are not reusable.
Readings not affected by acetaminophen. 2 hour warm-up time.
You can customize the alerts.
Covered by Medicare.
Approved for users over the age of two.
Can share data with caregivers.
Does not require calibration.
Transmitter lasts 3 months.

FreeStyle Libre

Abbott's Freestyle Libre is a revolutionary CGM device. It was approved in 2017 and is the first CGM that does not require fingerstick calibration or measurements. In terms of ease of use, the Freestyle Libre cannot be beaten; the sensor does not require a physician to apply and lasts fourteen days. The Freestyle Libre reader can store up to ninety days of your blood glucose data, and the sensor itself stores up to eight hours of data.

PROS CONS
Does not require calibrations. Reader must be charged once per week.
Sensor/transmitter all-in-one replaced every 14 days. Does not have alerts and alarms.
Covered by Medicare. Can't reuse sensors.
Can use with the reader or a smartphone. High levels of aspirin and vitamin C are considered interfering substances.
Warm-up time 1 hr. Only approved for users aged 18 or older.
Sensor can store eight hours of unread data.
Can share data with caregivers.

Freestyle Libre 2

Abbott's newest CGM, the FreeStyle Libre 2, was released in 2020 and is an integrated continuous glucose monitoring (iCGM) system for adults and children ages 4 and older with diabetes. Known for high levels of accuracy, the sensor lasts and provides customizable alarms.

PROS CONS
Does not require calibrations. Reader must be charged once per week.
Covered by Medicare. Can't reuse sensors.
Sensor/transmitter all-in-one replaced every 14 days. High levels of vitamin C may cause false readings.
Warm-up time 1 hour.
Approved for users as young as 4.
Can use with the reader.

Guardian Sensor 3

Medtronic's CGM is the Guardian Sensor 3, which provides continuous readings of your blood glucose levels. The sensor only lasts seven days, and it is smaller than the Enlite sensor.

Plus, this CGM system connects with the Sugar.IQ personal diabetes assistant by Medtronic. The assistant provides information about your daily patterns and how they affect your glucose levels.

PROS CONS
Alarms tell you when your blood sugar is too high or low. Requires fingerstick calibrations.
Has both Android and iPhone apps. 2-hour warm up period.
Can share your glucose data. Only approved for users aged 18 or older.
Using acetaminophen affects your readings.
Can't reuse sensors.

Eversense—Implantable CGM

The Eversense Implantable CGM uses an implanted sensor, which means that you don't have to worry about changing anything for 90 days. Because this CGM system uses an internal sensor, the transmitter still has to be placed on your skin, so you will still have part of the device visible. The Eversense CGM system uses continuous monitoring of your blood glucose levels. Because your levels are constantly monitored, alarms will sound when they go either too high or too low.

PROS CONS
Sensor can be worn for up to 90 days, transmitter lasts 1 year. Sensor must be implanted surgically.
Must be used with the user-friendly app from your smartphone, highly customizable. Transmitter is visible on the skin.
Alarms tell you when your blood sugar is too high or low. Requires calibrations twice per day.
Readings not affected by acetaminophen. Only approved for users aged 18 or older.
Can share data with caregivers. Sensors are not reusable.

Conclusion: Choosing Your CGM System

As you can tell, the four types of CGM have similarities and differences. You will find some variation in the location of the sensor (inside or outside your skin), the alarm system, the approved age range, and the sensor life. But, other than that, all four types of CGM deliver the same basic functions: continuously monitoring blood glucose levels without the need for fingersticks. Get your physician's recommendation, but feel free to discuss with him or her the pros and cons listed above and which CGM system will best fit your lifestyle before choosing a CGM system. If you have questions on the FreeStyle Libre, Freestyle Libre 2, or the Dexcom G6, or are wondering what your insurance benefits cover, contact US MED's customer service team by phone or by filling out this form.

Phone: 1-877-840-8218

If you need help using your CGM system for the first time, read US MED's how-to guide right here. Find out more about CGM-compatible apps here.

Click here to learn more about Freestyle Libre CGMs.

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Source: https://www.usmed.com/blog/what-are-continuous-glucose-monitoring-devices-and-how-to-choose-a-cgm/

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