Can't find GMI data on t:connect reports

I’m just curious. I am used to using the Dexcom clarity app to look at GMI over various time periods, but since switching to the tslim pump and software I can’t seem to find that parameter in any of the t:connect reports. If it’s there could someone please point me to it? Not a biggie at all if it’s not there; I’m just asking…


ps. If anyone’s interested why I don’t still use clarity, the reason is dexcom just explained to me that cgm data doesn’t always get uploaded to clarity if you’re using a tslim and t:connect and your pump is paired to your iphone, like I am. So they suggested I just stop trying to use clarity at all and stick with t:connect, and I said ok.

I am not sure that you got a reliable answer from Dexcom. There are tons of people who use the Dexcom G6 app and the t:connect app on iPhones and have no issue with data going to Dexcom. I find the Dexcom app much more reliable than the t:connect app but both get my data to the cloud.

I do not think that Tandem reports show GMI. They also don’t have the AGP report that is in Clarity.

I am not sure why you’re having a problem with your data being uploaded through the G6 app. I assume that you never closed out the app and your phone is always with you. Weird and unfortunate.

The GMI was a translation of average bg to an A1C type scale. Possibly the average had some weighting to emphasize more recent data in a 90-day window to match average life of red blue cells, but that’s speculation. You can find many threads on TuD where we postulate the math behind it and then complain it doesn’t match our A1C.

In past several years Dexcom has de-emphasized GMI in its reports (and several years they stopped saying that it is in any way related to A1C). It might be time for all of us to use the average bg numbers instead.


I don’t like the way that my A1c correlates poorly with my average BG. The GMI did nothing to correct that. I agree with you. I think time in range and glucose variability as represented by Dexcom’s standard deviation and coefficient of variation are much more in synch with the glycemia that I live with every day.

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I dismiss the GMI because it is consistently higher than my A1c and somewhat higher than my average BG. I prefer statistics that make me feel good…


That is why i only use pictures of me from far away. Like from Ohio when I am in CA.


@Laddie the issue might be that he is also connected to his pump therefore attempting to have three connection points and not the allowed two. Might be better service using something like Tidepool.

@El_Ver Your remark confuses me. I don’t see how his setup is any different than the setup for other Tandem users. The Dexcom transmitter communicates with his pump and his phone (G6 app) through two different Bluetooth channels (one for a receiver device and one for a smart device). His pump communicates with his phone (t:connect app) through another Bluetooth channel. His pump does not communicate with the G6 app so IMO it should have nothing to do with Dexcom data being automatically uploaded through the G6 app. There are only two connection points with the Dexcom transmitter and the Dexcom transmitter is not part of the pump/t:connect communication.

But maybe I am not understanding what you are saying.

I agree. This is not an issue for most people.

I have dexcom ap and clarity and tandem ap and sugarmate all running together.

You can have unlimited connections of receiver devices like phones or old style receivers. You can only pair one medical device, a pump. It won’t allow you to pair 2 pumps for good reason.

Back with G4 (and maybe early G5?) you could have all the receivers you wanted because the Dexcom RF transmitter just sent out the signal and any receiver with the code could pick it up. The brains were in the receiver devices so my Animas pump sometimes showed different numbers than my Dexcom receiver. I can also remember using two Dexcom receivers simultaneously but I can’t remember why. The initial Dexcom phone app got its info from the Dexcom receiver not the transmitter.

That is not true with G6.

Because of the necessity to pair with the G6 transmitter using Bluetooth, you can no longer have multiple receivers or smart devices. Technically one receiver (pump) medical device communicates with one Bluetooth channel and one smartphone device pairs with the other Bluetooth channel. The Bluetooth channels are different so you can’t have two phones connecting with the transmitter or two pumps.

I think most people know that SugarMate works through Dexcom Share and does not get its information directly from the transmitter. Thus you can have both the G6 app and Sugarmate on your phone.

Someone with xdrip can correct me, but I think xdrip pairs with the transmitter Bluetooth and therefore you can’t have both the G6 app and xdrip working on your phone at the same time.

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Although I think I may be able to use dexcom app as primary phone app direct to transmitter, and have xDrip as a follower.
But I don’t have android that dexcom supports, so would need the hacked dexcom app to load to phone. Then it could load to Clarity and followers. (I think?).

But what I have now works well for me.

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Since using T:Connect, I don’t really focus on A1C or GMI.

The closest to it can be calculated from the web T:Connect data. I brought up 90 days of history for cgm data, and could see average bg (sensor value) for each hour of those days. (Maybe Tandem will add calc and include in report generation).

From that, I averaged those 24 values to an overall BG average (over the 3 month range I selected).

I found this calc for GMI.

3.31 + (.02392 X avg cgm in mg/dl ).


This is also good info on GMI.

You are spot on @Laddie

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