For the past 10 months I’ve been using the 670G, touted as the first closed loop insulin pump system by MiniMed. I was so excited to try out the 670G but the excitement wore off very quickly. Aside from the constant requests to “Enter a new BG for Auto Mode”, the accuracy of the Minimed 670G is inaccurate.
670G Inaccurate BG Readings
Here’s an example of one of many inaccurate blood glucose (bg) readings on my MiniMed 670G pump system and more.
After waking up last Saturday I looked at my 670G pump and it said my bg was 128 mg/dl. However, when I checked with my Contour glucometer, it said my bg was 171 mg/dl. I checked again with a finger stick to be sure and it said the same 171. That’s 43 points off and totally unacceptable. Also, more then the 20% off that MiniMed says the system allows. There’s been many other times my bg readings were off by more than 20%. Two weeks ago around 10am and only having one cup of coffee (without sugar), my pump said my bg was 117, however, when testing with my tester, it said my bg was 197 mg/dl. Let me reiterate, I always test my sugar more than once when it’s off by this much. I even spoke to support regarding this inaccuracy issue and they say there’s nothing wrong with my system. I find that hard to believe! If this is the case then the MiniMed 670G is inaccurate and not trustworthy for me.
Guardian Sensor 3 and Guardian Link 3 Transmitter
The 670G uses the Guardian Sensor 3 and Guardian Link 3 Transmitter for its continuous glucose monitoring (CGM). This CGM system is suppose to be accurate and a rival to Dexcom’s G6 CGM. I have never tried the Dexcom G6 but all the literature I read and heard about it, is all good and extremely accurate. As far as the 670G’s Guardian sensor and link CGM, it is very inaccurate in my experience. Keep in mind, I’m an insulin pump user for over 20 years, I know how to count carbs, use pump functions and also very familiar with the 670G system. It seems like the most important task with the 670G is to be spot on when counting carbs. If you under estimate your carbs you won’t bolus enough and the system can’t correct it with the micro boluses.
My 670G Conclusion
I guess you can say this is my MiniMed 670G review or just me venting about the system. Either way, my conclusion is the MiniMed 670G closed loop insulin pump system is inaccurate! Looking forward to switching to an improved autonomous insulin pump system or Tandem t:slim X2 in the near future using the Dexcom G6 CGM. #670g #670greview
I’m a type 1 diabetic with diabetes knowledge in t1d and t2d, as well as nutrition and low-carb keto diet information, fitness and exercise programs to help keep you in optimal diabetes health. Take advantage of our diabetic health tools for a healthier lifestyle!
View Comments (2)
Thanks for the heads up. Medtronic has been really good to me, that being said I am not going to "upgrade " I received several calls from Medtronic to get me to switch to the "upgrade " . I had a bad feeling and my diabetes coach told me that it was a bad idea. I am currently using the dexcom and I am pretty happy with it. I have had it less than 4 months so I am still figuring it out. The dexcom is pretty accurate as long as you don't calibate it to much.it has been 20 points off but 8 had been calibrating it way to much. It runs just behind my regularl finger stick. Its like a train is the way my coach explained it. It fl right in line once I quit messing with it. If I am going to bolis I always finger stick as I DO NOT trust any of the machines yet. However this is the most accurate machine that I have ever used. Thanks again,be safe, mask up, we will survive.
I also have a minimed 670g. Extremely inaccurate. I have had it off by over 140 points at times. For a while it seemed ok and i got lazy. Had my a1c done and i was at 8.5! Started checking my sensor readings with finger stick readings more often and its never even close. Im paying a lot of money for these cgm sensors and they dont even work. Im eligible in October for a new pump and I am going with the tandem. A couple people I know switched for Medtronics to the tandem and they said they will never go back. Im done with this faulty medtronics pump and cgm.