770G and SG3

So I have had my 770G and SG3 for a year. I am not happy with this system. The SG3 will give me BG now readings at off the wall times. My educator says it is under reading meaning my sensor is not picking up. Yes I change things and do everything like I am supposed to. Now I am having issues with my pump where I cover my carbs but then I will get an auto mode has been at max delivery for 4 hours enter BG to continue in auto mode. I am so over this system. I am getting blood work next week and am anxious to see if there is any change to my A1C. I really have not seen any tighter control. I have seen more ups and downs. Don’t know if it is my body, me eating too much, me not understanding, or the system. All I know is my anxiety is over the top. BTW I have been a type 1 for 48 years.

I have been a T1D for 55 yrs. My endo wants me to go back on a tubed pump. I went tubeless sometime ago because of that rollercoaster ride. Hope ur A1C is good and u find out what is going on. Good luck.

It took me a couple of months to adjust to a looped pump.
I was on Medtronic for years.
My settings needed a lot of altering, carb ratio and sensitivity.
Once I got that settled it has been pretty awesome for me.

My a1c was running around 7 for 30 years.
It has been consistently in the 5.5 range for almost a year now. I get tested every 2 months.

I went with the Tandem only because it uses Dexcom sensors and I was so over Medtronic sensors a year ago when it was time for a new pump.

Tandem allows you to have a little more flexibility. You can bolus with auto mode running. And you can also alter the bolus that is calculated if you want.

I think it also has a maximum basal rate, which I’ve never even been close to.
The maximum bolus is something you can set for yourself. I have mine set way up at 10 units but I almost never go that big unless I had a set failure.
I know the. Medtronic has a max bolus setting that you can change too.

You might want to try basal testing to get a good baseline, it’s easiest to do at night. Start a couple of hours before bed. And track how much basal insulin you got over night.

Then go with that number in your basal settings. My daytime is higher but not much. I run 0.9 at night and max 1.3 during the day.

Once you get your nights set, you can test out mornings. Just don’t eat one morning and see how much insulin your pump gives you to stay in range. Then move on to afternoons. Etc.

The only caveat is that you need to be fasting to get good data.
It’s not easy to fast a whole day, so breaking it up is doable.

Good luck on your test, and don’t give up on your pump yet,it’s a really good tool, once it’s going right, you will appreciate it

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I am also using the 770g and sensors but I run in manual mode. I tried auto mode with the 670g and hated it. I do much better in manual mode.

In auto mode used to feel more in control. But lately I am wondering if that is the way to go.

I ran in manual mode on my paradigm pump. Because there was no auto mode back then.
Running auto mode on my Tandem “CIQ” has really changed my control.
I’m still on top of corrections but when I miscalculate carbs or whatever, it manages to correct it most of the time.
But the biggest change is the night time control. I never go high at night and my predawn spike is gone.

Everyone has their own comfort level. If I was not using a loop on my pump, I would likely go back to injections.

If you feel unsafe or stressed out, its ok to go back on syringe insulin for a while and see if things straighten out. Its been my experience that there is a lot of bad tech out there. I’ve never met anyone who said something positive about the system automation in the 770. I’m not saying that they don’t exist, just that I have never met someone who had anything positive to say.

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I have had T1D for 46 years. For the first 38 years I did injections. In 2013 I chose Omnipod because I did not want a tubed pump and I am very basal sensitive. Having to stop insulin flow for showers or swims or any other reason would create a roller coaster. It took me a while to trust the pump and get my rates figured out. It didn’t help that the CDE who originally did the settings was ultra conservative to avoid hypos. I had started using Dexcom 6 months before just to be sure I would be able to handle having something attached 24/7. I trust Dexcom with my life and I would give up my pump before I would give up Dexcom. My A1C increased from 5.7 to 6.2 in the first few months but over time I became far more comfortable being bold with insulin. 2 years ago I decided to try a DIY Hybrid closed loop system called Loop. It is not for the feint of heart because you do not have a number to call tech support. It is not FDA approved. You have to build the app yourself on your phone with a Mac computer or a virtual Mac on a PC. You need to do a lot of reading and learning. But with Loop it is like I no longer have diabetes. My A1C is 5.2% with little effort. I eat carbs and really like them and I just let Loop know the amount and type of food I am eating. I set my own blood glucose targets and Loop keeps me there. Omnipod is working on their own version of Loop called Omnipod 5. While I will not change over, I know a lot of people who can’t wait for it to be approved by the FDA.
Medtronic rushed the 670G to the market with a terrible CGM sensor and system requiring users to calibrate multiple times a day. Every time they introduce a “new and improved” sensor, it is the same old story. They should just let Dexcom and Abbott do CGM’s and stick to making pumps that will be compatible.


I am on a 770 with the Guardian3 sensors. The system isn’t perfect but it is alot better than manual mode imo. I at least get to sleep through the night and I get 80-95% on target most days and in April 2022 the guardian 4 sensors will be available with zero calibrations. I have read of people’s opinion on the 770/780 support facebook page. They give it a glowing review. I am happy with this system but will be even happier in the coming months.

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