Why

[MarkStAlbans]

Indeed 🙂

I spent years as a control systems engineer dealing with exactly these issues 🙂

there are no absolutes in measurement

 

[helli]

Libre 3 monitors I think is next step and weight down by another couple of stone won’t go amiss

Is there a reason why you suggest this version of the Libre sensors?
The reason I ask is that the Libre 3 is not available to purchase in the UK. It is only available on prescription for a few people, usually those with Type 1 managed with an insulin pump.
Libre 2+ provides the same data, is used by thousands of people and is available to be purchase - you could subscribe for the 2 week free trial from their website .

 

[MarkStAlbans]

Is there a reason why you suggest this version of the Libre sensors?
The reason I ask is that the Libre 3 is not available to purchase in the UK. It is only available on prescription for a few people, usually those with Type 1 managed with an insulin pump.
Libre 2+ provides the same data, is used by thousands of people and is available to be purchase - you could subscribe for the 2 week free trial from their website .

I understand the only material difference is the physical enclosure size of the sensor, its smaller as I understand

 

[rebrascora]

In any measurement system there is a margin of error thats the nature of physical measurement systems and the statistical models on which they rely, I was reporting my experience.only, not recommending any course of action. 🙂

CGM isn't measuring HbA1c though. It is measuring your interstitial fluid glucose, then extrapolating it's results to try to predict your Blood Glucose and then taking your average Blood Glucose and using a formula to predict your HbA1c.
It is important to understand that HbA1c is a measure of the amount of glucose stuck to your red blood cells. Those cells live/exist for approx. 3 months during which time, depending upon the concentration of glucose in your blood, a percentage sticks to them and is not released, so cells that are more than 30 days old will still have more glucose stuck to them from prior to your current management, but obviously newer red blood cells will reflect your current BG levels and have less glucose. If you maintain your current good BG levels then after 3 months your CGM prediction will be pretty close to your actual HbA1c although most of us find that it slightly under predicts, but 2 weeks or 30 days into using it, it will be significantly adrift because it is measuring something quite different to HbA1c and until you have a full period of red blood cell life span it will not be a true prediction of your current HbA1c..

 

[Lucyr]

Its still the same after 30 days, just stating the facts from the technology.

30 days of cgm data isn’t a hba1c either. It’s just an average 30 days blood sugar multiplied by something to estimate what your a1c might be if you have that average blood sugar for another couple of months. Your actual a1c will be higher as you were higher for the two months before the last 30 days.

 

[rebrascora]

30 days of cgm data isn’t a hba1c either. It’s just an average 30 days blood sugar multiplied by something to estimate what your a1c might be if you have that average blood sugar for another couple of months. Your actual a1c will be higher as you were higher for the two months before the last 30 days.

So much more succinct than my laborious explanation above! 🙄