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I believe the A1C estimate will get more accurate as it has more data to base the algorithm on. It’s also worth noting you can use libreview.com to view a more detailed, in depth look at your stats.

Personally I love statistics and numbers, so libreview is a must for me. It also shows the GMI as opposed to the estimated A1C that the app shows. If you’re logging carbs/eating or exercise in the LibreLink app it’ll overlay it on top of hourly graphs so you can easily see spikes and trends.
 
Yesterday evening/ night and this morning is a classic example of hw I need to get my head around figures. After an evening meal I was getting around 6.0. same pre prandial, until 2 hours after when it started climbing It climed and dipped for the next 2 hours, so 4 hours post prandial settling at around 7.0 to 7.5 for the next 6 hours. Then it suddenly jumps to 10.8 at 8am just after getting up then dropped off quite rapidly until back around 7.5 30 mins later. Now at 9am is 6.2 and still dropping. Why the large hike at at 8am some 12 hours after the last intake of food?
 
It’s not uncommon and is known as dawn phenomenon or foot on the floor. It’s unrelated to your previous food consumption. Basically your body dumping glucose in anticipation of you needing energy to get on with your day.
For me it means it’s essential to avoid carbs first thing as then my levels stay high for the rest of the morning so cereals, toast, porridge etc is not for me and most T2s.
 
Yoghurt and blueberries and a few black coffees is the order of the day for my breakfast. Though as am higher now than most mornings, well all mornings so far just taking coffees today.
 
I find the Libre can be a bit flakey with high blood sugar levels. If it’s an odd and unexpected number I will finger prick. As for the rise in the early morning, your liver is likely dumping in preparation for activity. Your pancreas more than likely registered the liver dump and released insulin to bring you back down to homeostasis. Your body may still have some insulin sensitivity, possibly you still have a reasonable first phase insulin release. This sensitivity is often compromised with full Type 2 diabetes.
 
How does my liver know I am not going to spend the day in bed?
 
Livers know everything! Nothing happens without your liver knowing all. Resistance is futile, but they respond to kindness.
 
Bogart99 said:
How does my liver know I am not going to spend the day in bed?
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It doewsn't, but it probably assumes you are going to need some extra glucose to dodge a few sabre toothed tigers and catch a mammoth or two for your breakfast. It's making glucose from its own stores, which is what they are there for. In evolutionary terms some of us have had the luxury of a guaranteed food supply only very recently.

I've found I can fool my liver with three almonds. Suddenly my liver accepts I've had "food" so the glucose dump stops. If I don't eat anything it will continue dumping and raising my blood glucose for at least seven hours (which is when I got bored with the experiment and ate something), but I imagine it might well continue keeping me fuelled until its stores had gone.
 
Melgar said:
I find the Libre can be a bit flakey with high blood sugar levels. If it’s an odd and unexpected number I will finger prick.
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Yes, the physics used in CGMs is not "good enough" for accurately detecting a wide range of BG. Therefore, CGM are designed to be most accurate at the more "expected" BG which tends to be between about 4.5 and 9.5. The advice is to test with finger prick when high and low.
Sadly, physics is difficult to change.
 
Bogart99 said:
How does my liver know I am not going to spend the day in bed?
Click to expand...
Firstly, the body operates around circadian cycles. In other words we have an internal clock. This internal clock has a direct consequence on our metabolic system. To put it simply we all have a master circadian clock, this master circadian clock is operated from the hypothalamus. We also have autonomous circadian clocks present in numerous tissues in the body. Importantly they are present in the cells that regulate glucose metabolism. They are present in Beta cells, Skeletal muscle clocks and Hepatocyte cells. Beta cells secrete insulin; skeletal muscles - insulin mediated glucose uptake; and Hepatocyte clocks - Insulin-mediated glucose production. They are all inter related. In other words your body operates around its own internal circadian system. Thus, your body knows when to sleep, knows when to eat etc. This has a bearing on our metabolism. If you have jet lag, your body’s system is messed up and we often feel lousy. Even our heart rate increases with a disruption to our circadian patterns. Same with our blood sugars. So yes, the liver knows when to dump because of the body’s circadian system.
 
Have now had a sensor on 2 weeks and has just finished. I asked a question from Freestyle about some figures received but got a very confusing reply so am wondering if anyone can shed some light in this.
Attached is a summary over the 2 weeks of my glucose summary. It states average glucose 6.1mmol/L which by my reckoning equates if exptrapolated to an HBa1C of 36.5mmol/mol or 4.5%. I am unsure where the figure of 41mmol
or5.9% come from. Is it something to do with the 15.9% variability which is another confusing figure.
And finally how has all this info been gathered? At no time have I sent any of it to Freestyle.
 

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@Bogart99 this article explains the difference between HBA1C and GMI.
Bear in mind, both the GMI method and your method of using the average BG are only an estimate of HBA1c so I would not be surprised that they are different, especially as they are based on such a small sample (2 weeks rather than 3 months) of data.
AS for how has this data been gathered, when you registered the Libre app, you would have included your details which you used to log in to LibreView. Your data is uploaded to the LibreView cloud from your phone. I believe this is only done when you have access to wifi/
 
The 14 days wouldn't be anywhere near enough time to estimate an accurate HBA1c/GMI, however it shows you your progress and how well you're doing within that time frame.

I have been using the Libre2 86 days, which shows a GMI of 38/5.6% and my actual HBA1c blood test I had last week came back at 42. So it was pretty close. The actual LibreLink app "Estimated A1C" section shows a different value of 40, so that was even closer.
 
Sounds like I can then ignore the GMI figure. Uploading the details sounds like Big Brother watching me
 
Yes agree and understand one needs more than 14 days but is a better estimate than none. Easier than having fingers like pin cushions. Have another sensor to use so that will give me another 14 days data.
 
Bogart99 said:
Sounds like I can then ignore the GMI figure. Uploading the details sounds like Big Brother watching me
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I have been using the LIbre for a few years and find the GMI number a useful metric to track but, for me, a terrible indication of HBA1c (last time I checked it was 20% lower than my blood test). Given my HBA1c is only taken every 6 months, it is good to see whether I am maintaining the same level of management between blood tests.
As for Big Brother watching you, I do not think anyone is able to look at your data ... or if they are, it is anonymised. I am sure it is in the long waffle that we agreed to when we registered. I find it worthwhile to be able to access the kind of analysis that you are looking at without needing to work out how to extract the data from my phone and manipulate spreadsheets.
 
Oh heck yes very easy to get the data. And as you say I probably clicked something on registering. I have actually got my surgery to agree to do a blood test every month for the next 6 months. Will be interesting to see the results.
 
Time for another question. Am still watching YouTube videos. One chap who strongly disagrees with ADA advice states that the pre and post meal blood glucose figures are much more usefull than HbA1c figures. What I have been thinking is that yes he quotes a figure one should be below one hour post meal and another figure for 2 hours post meal. Now surely these figures are affected by what one ate and how much of it. If that is true how can post meal targets be gospel?
 
I don't believe that the 1hr post prandial figure could be relied on. It may be too soon after the highest figure which is usually in the first hour after eating. For example, if you ate a lot of complex carbs or carbs with fat then that first high is delayed compare with just eating bread or sugar or potato.

There are slight variations in what the number should be on different diabetes web sites, but the one we use most here for 2hrs post prandial is it should be no more than 2mmol greater than pre-prandial or 8.0 mmol (if the pre-prandial was more than 6.0 mmol). Now some people say to allow up to a +3.0mmol and up to 8.5mmol (instead of 8.0) others say the high 2hrs post-prandial should only be up to 7.8 mmol. To be honest, it isn't something to get obsessive about, just pick figures and stick with them, because neither G Meters nor GGMs are that accurate that it matters much.

The theory behind it is that we are trying to mimic the response of a non-diabetic to a carby meal, and generally by the 2hr post prandial mark they should have their BG roughly at what it was pre-prandial!
 
Yes the figures can vary and one I think needs a wide enough margin to encompass what is acceptable.
 
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