Best Continuous Glucose Monitor

I’ve been doing research for information on a CGM. This will be our first time buying and using one, and we have decided to get either Dexcom or Medtronic. Based on experience, which one do you guys suggest as the best and most reliable of the two CGMs?

Not Medtronic. You can search and read all about posts regarding both CGMs on the forum. I, personally, just bought Dexcom G6. But, it is well known that Medtronic sensors perform poorly. It is so well accepted that people may or may not even respond to this question. Search around on the site for discussions. We have very few medtronic sensor users here…unless they are on a 670g.

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This is a no-brainer: Dexcom G6.
I started with the G6 last September. I don’t calibrate and most days I don’t even do any fingersticks at all.

Dexcom, Dexcom, Dexcom. Hands down.

Dexcom G6, I have not had a Medtronic CGM but as @mohe0001 people generally aren’t as happy with them. I have had a Libre and it is the cheapest route and works, I was very happy with it when I had it, but the Dexcom is better, especially since you can calibrate it, and that makes a big difference. It also has alarms you can set which helps alert you to when you are going too high or low.

Dexcom 100%

Dexcom according to all the threads on this board and according to Joslin Diabetes Center as well.

And according to this former Medtronic CGM wearer. Ditto for my wife. I wished I had switched long ago but the G5 wasn’t covered by insurance so I went without any CGM for quite a while.

I’ve used Dexcom CGMs for 10 years now. Based on many years of positive Dexcom experience and the many disparaging comments made by Medtronic CGM users over the years, Dexcom is clearly better. I don’t see this as a close call.


If you want your CGM to automatically control the infusion of insulin based on your “actual” BG level, you have no choice but to pair up the Medtronic 670G Pump with the Guardian 3 sensor. Since switching from the Medtronic 530 to the 670g linked system, my A1c has improved from 7.8 to 7.2.

After a six month lurning curve, I have significantly reduced the number of annoying alarms. However, in my situation, the capability to monitor and maintain appropriate BG levels automatically, far out ways the annoying alarms.

Before year’s end Tandem will have Contol-IQ based on their Tslim:X2 pump and a Dexcom G6 CGM.

@Emma4 Do you have a pump or do you plan on getting one? Are you interested in closed-loop? If so I would wait so you can consider both options. I’m using the Tandem X2 with Basal-IQ - an automatic basal suspend based on the G6 for low BG - and it’s fantastic.

@Paytone It’s for my younger brother. He had a pump from Medtronic 5 years ago, but it malfunctioned in the middle of the night and lead to a traumatic brain injury.

I’m really sorry about that, Emma4. I had difficulty in the past on Medtronic equipment. We just didn’t know then, what we know now. Thanks for helping a fellow diabetic out with this stuff. We love our type 3’s (helpers of type 1’s) here.

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@mohe0001 Thank you. True, we just didn’t know back then. You’re welcome. I find all of this stuff about diabetes fascinating.

Sorry to hear about your brother Emma4. He’s lucky to have someone like you to lend a helping hand.

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Emma - what happened to your brother is horrible. It’s warms my heart to learn you’re now looking out for his best interests.

Bless you :two_hearts:

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oh, my goodness! How awful. How is he now?

I love my Medtronic Guardian sensor and transmitter. I remain a big fan.

Note: I am a Medtronic ambassador. My opinions are my own. They did not pay me to say nice things about Medtronic devices or the company. OK, they sent me a shirt and a cup but even I am more expensive than that.

@Paytone Thank you for your kind words.