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RE: [IP] CGM Accuracy



 Even though I have been on a pump now for 20 years, and CGM has been out for a
while, I finally recently got a pump with the CGM sensor. I do know that the
Blood Glucose are not the same, but as this article said they should be close.

 What is the definition of close? I was informed that at first they will be far
apart, but as I keep calibrating it consistently 4 times a day (Breakfast Lunch,
Dinner & at Bedtime) they will get closer. I have been using the CGM now for
about 2 months and I am still seeing it approximately 40 mg/dl lower then my
finger stick.

 Once the alarm from the pump woke me up because it was reading my sugar at 54,
I certainly did not feel low and when I tested I was 80. After a few days of
this I turned off the low alarm.

So what is meant by close, I figured it would be more like 10 mg/dl difference.


-----Original Message-----
 From: email @ redacted
[mailto:email @ redacted] On Behalf Of Irv Perlman
Sent: Thursday, June 30, 2016 5:23 PM
To: email @ redacted
Subject: Re: [IP] CGM Accuracy

 I use dexcom with Tslim pump and find the readings quite accurate. My endo
reminded me that finger sticks can a 20% standard deviation.

 On Thu, Jun 30, 2016 at 5:04 PM, Susan Lane <
email @ redacted> wrote:

> I use the Dexcom and I think the article was quite accurate
>
> On Thu, Jun 30, 2016 at 1:27 PM, <
> email @ redacted> wrote:
>
> >  The following is from an article titled 'Five Myths of CGM' 
> > published in the June issue of Medtronic Diabetes' June, 2016 'News 
> > to Infuse' email.
> >
> > "Myth 2: CGM devices are not accurate.
> >
> >  Reality: An oldie but goodie. It is important to note that sensor
> glucose
> > readings are taken from your interstitial fluid (fluid surrounding 
> > the cells in your tissue), whereas finger stick tests are taken 
> > directly from your blood.
> > Because the readings are from two different places, there is a 
> > natural
> lag
> > between glucose levels in the interstitial fluid and glucose levels 
> > in
> the
> > blood. Therefore, itb s normal, and should be expected, for your 
> > sensor glucose readings and BG readings to be different but for the 
> > most part they
> should
> > be
> > close.
> >
> >  One thing to keep in mind is that when you check your BG other CGMs 
> > automatically change the sensor number to match the BG number. This 
> > does not necessarily mean itb s more accurate. Often, it doesnb t 
> > make sense to
> just
> > match the BG since the sensor is measuring glucose from interstitial 
> > fluid, a different part of the tissue (not the blood). Our sensors 
> > take into
> account
> > multiple factors in the calibration to provide an accurate glucose 
> > sensor reading."
> >
> >  If this is true then Dexcom's perceived accuracy may be a self
> fulfilling
> > prophecy. Is this article factually correct? I have never used a 
> > Dexcom CGM. Has anybody used both the Enlite and Dexcom sensors?
> >
> > Jerry Smith
> > .
> > Follow us at https://www.twitter.com/insulinpumpers
> > Make a long URL short at http://type1.org Donate with every purchase 
> > http://smile.amazon.com/ (select your charity = Insulin Pumpers)
> .
> Follow us at https://www.twitter.com/insulinpumpers
> Make a long URL short at http://type1.org Donate with every purchase 
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>



-- 
Irv
Follow us at https://www.twitter.com/insulinpumpers
Make a long URL short at http://type1.org
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(select your charity = Insulin Pumpers)
.
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