Thank you. I will work on TIR. I did look into the accuracy and precision of glucometers. and CGMs. Alot to absorb, but the important issue is that they all work and give a workable number. I appreciate your comments/suggestions, managing trends does seem to work better.

The sensors, mostly (you get a failure once in a while) are quite accurate but you shouldn't try to compare them to a finger stick - they are measuring different things

A Lab draw blood test, tests the sugar levels in our Blood Plasma

A Finger Stick tests the blood sugar level in Whole Capillary Blood, and

A CGM test the blood sugar level in Interstitial Fluid (fluid around the cells)

At any given instant in time all three readings are going to be different, sometimes quite different if our blood sugar is rising or falling somewhat rapidly (which it does - once you use a CGM you see just how much it "swings" almost minute by minute sometimes)

As the sugar "migrates" from veins to capillaries to cell fluid it will be in different concentrations and your stick test will be showing more or less sugar than the cell fluid unless your blood sugar is perfectly stable

The big test is "on average". The CGM is often about 15 minutes "behind" the stick test, but at the end of the day it captured all the same numbers as was in the blood at that "instant in time"

Before my last A1C test (May 2023 - I test once a year) I dumped my Libre data

It estimated my A1C at 5.6% based on the last 90 days of data (covering about 7 different sensors)

The Lab Test came back with an A1C of 5.6%

Sounds pretty accurate to me "on average"

I no longer look at single numbers - we get fixated when we finger stick because we see so few of them so they all seem important

Now I simply manage to Time In Range and forget about individual numbers - it's just a different perspective and it did take me a while to get used to it, but once I did I realized it is a way better way to manage

My Libre2 takes 1440 "finger sticks a day", it is infinitely more accurate then a couple of "sticks" a day