Should You Use a Continuous Glucose Monitor for Type 2 Diabetes?
Wondering if you can use a continuous glucose monitor for type 2 diabetes? I don't blame you, I love these little devices!
A few years ago, I worked in the wellness division of a hospital. It was my team's job to screen over 12,000 employees for their cholesterol and blood sugar levels. This required getting what seemed like a half-pint of blood out of a finger stick, and we used pretty big lancets to do the job.
I stuck my own finger for the test, and I really hit a nerve! This sounds whiny — not to mention a little nuts — but I'm not kidding when I say that I had little twinges of pain in that finger off and on for six weeks.
I can only imagine how torturous it must be for those of you who have to stick yourselves multiple times a day, every day. Truly, I feel for you. This brings me to why I love continuous glucose monitors, also known as CGMs!
How do continuous glucose monitors work?
CGMs consist of three main components, sensors, transmitters, and readers, or receivers.
CGM sensors
With CGMs, a very thin wire is inserted just under your skin. The wire stays there for 10-14 days, depending on the brand of the device. This wire is called a sensor because it "senses" the amount of sugar in your bloodstream. The sensor is secured to your body with medical-grade tape.
CGM transmitters and receivers
A transmitter is then attached to the sensor. The transmitter is the technology that takes the information from the sensor and communicates it to the device that lets you see your blood sugar levels. You can read your blood sugar levels on a "receiver" or "reader" that comes included with your CGM. Alternatively, you can read your blood sugar levels on your smartphone after downloading an app.
A continuous glucose monitor can help you lower your A1c
Of course, there's the benefit of eliminating finger sticks. But people who use CGMs can lower their A1cs because they get lots of information about how their bodies react to different foods and insulin doses. They also get information not just about where their blood sugar levels are right now, but where their blood sugar levels are headed. That makes a huge difference in their diabetes management. If you know that your blood sugar is rapidly falling, you can eat something before you're low. That saves you from the miserable feeling of hypoglycemia and the time it takes to recover from that misery.
CGMs available in the US today
There are two main brands of CGMs available to people with diabetes in the US today:
Freestyle Libre is wearable for 14 days. It does not require fingerstick calibration.
Dexcom is wearable for 10 days and does not require fingerstick calibration.
Medtronic and Senseonic also make continuous glucose monitors, but they both require two fingersticks daily, so I don't recommend them.
The cost of continuous glucose monitors
Your insurance company may cover the cost of a CGM. If you were to pay cash, these are the approximate costs:
Freestyle: A one-time cost of $70-$100 for the reader, and about $125 monthly for the sensors.
Dexcom: Costco offers Dexcom discounts for members. At this time, advertised fees are a one-time cost of $218 for the receiver, $318 for a 3-pack of sensors, and $146 for a transmitter, bringing the ongoing monthly cost to approximately $450. Dexcom is the more expensive option.
Who is a candidate for a CGM?
Medicare requires that a person meet these criteria before they will pay for a CGM:
Have diabetes, either type 1 or type 2
Take insulin or have a history of problems with low blood sugar
Have a prescription for the CGM and supplies and instructions for how often to test your blood sugar
Have been trained on how to use the CGM
Have routine visits with your doctor
Other insurance companies may have different criteria, but typically insurance companies follow the same criteria as Medicare when it comes to allowing costs. If you want your insurance company to cover a CGM, you'll need to check your policy to see if they have any particular requirements other than a doctor's prescription.
Which continuous glucose monitor is best for me?
If you have insurance, use the CGM preferred by your insurance company to save money. All CGMs are approved for use by people with diabetes and will save your fingers, leading to more frequent blood sugar monitoring and, as a result, better blood sugar management.
The bottom line about continuous glucose monitors
If finger sticks don't bother you but technology does, CGMs are not a good fit for you. Consider a CGM if you'd love to stop sticking your fingers and your insurance will cover it. If you're afraid to go to bed at night because you're not sure if your blood sugar will bottom out while you're sleeping, a CGM may help you get a good night's rest.
Action Steps:
If you avoid checking your blood sugar because you dislike finger sticks — and who could blame you — find out whether or not you're a candidate for a CGM.
Use the criteria above if you are covered by Medicare.
If you have private insurance, call your insurance company and ask whether they cover CGMs, what criteria you need to meet, and if they have a preferred device.
