Dexcom CGM Users, Good News!

By GabbyPA Latest Reply 2014-11-12 05:41:23 -0600
Started 2014-11-11 07:33:52 -0600

Dexcom has released a new upgrade to the software that has increased accuracy of your CGM.
"FREE download that improves accuracy to 9% vs. fingersticks, available now!"

9% more accurate nearly cuts the allowed variations of glucose meters by a good amount. That is great news. More accuracy in testing helps us have more confidence in how we want to treat the situation at hand.

There are many members here who use this device. Do you have the update? Is it helping?

6 replies

rcmodelr 2014-11-12 01:08:41 -0600 Report

This page shows their stated accuracy changes with the software update…

My previous G4 seemed consistently more accurate than my current one I got this year. I'll wait until next sensor re-start, apply the update, and see if accuracy really improves.

But even with this one as long as CGM says my BG is remaining steady it's usually only 0 - 25 off from my meter readings… Where the accuracy really suffers is when BG is changing in which case the CGM seems to accurately say which direction my BG is heading but it usually over-estimates how high or low I'm getting so during rapid rise CGM will say I'm at 279 and rising rapidly but when I check with meter, the meter says I'm really still only around 220… But if I don't do a correction Bolus at that time, when the CGM says my BG stabilized, it will usually stabilize at a reading reasonably close to what my meter says my actual BG really is at.

Chuck Fisher
Chuck Fisher 2014-11-12 00:05:33 -0600 Report

Gabby: your statements are inaccurate. From the linked article…
The previous G4 Platinum software had an accuracy vs. lab reference of 13%, and this 4% increase in accuracy makes the Dexcom CGM have an accuracy percentage in the range of standard fingerstick accuracy.

So the statement "improves accuracy to 9% vs. fingersticks" is incorrect. The accuracy is compared to a lab reference. Also, the statement "9% more accurate nearly cuts the allowed variations of glucose meters in half" is not correct. A 4% change (from 13% to 9%) is not the same as "half". Half of 13% is 6.5%. The 4% represents a 30% change.

GabbyPA 2014-11-12 05:41:23 -0600 Report

I am sorry. That statement was taken directly from the article. That is why it's in quotes. The meter allowable variations I understood to be nearly 20% off. That is my misunderstanding then. I removed the "half" reference.
Any improvement is good though, that we cannot debate.

DawnieD 2014-11-11 17:21:00 -0600 Report

Thanks Gabby! I'm trying to go thru the process to get one, if my Medicare will cover it (do you know if they do?). I've also directly contacted the company with my info, but that was months ago and I never heard back.

LRD 2014-11-11 10:14:41 -0600 Report

That sounds great! We need to get a petition going on getting stores to carry appropriate foods that are not high priced. Too many people are going to the cheaper brands which are not good for you because of the price. Good, proper food is high for most people, especially the older ones. We need to take action as the younger ones are not eating properly and, therefore, getting diabeties. Linda

Richard157 2014-11-11 08:28:47 -0600 Report

Thanks Gabby, this is very good news for Dexcom users. I used the older Dexcom7+, and the accuracy was very poor for me. My insurance covered CGMs back then. When the much more accurate Dexcom with the G4 sensor became available, my insurance had changed. Medicare does not cover CGM's for us older folks. There is a bill being considered in Congress. If that bill is passed, Medicare will cover CGMs. I have too many highs and lows, and using the new Dexcom would help me very much. Older people who have Medicare coverage should not be excluded!!!