Average BG mmol/L to HbA1c conversion - Libre

[LittleGreyCat]

https://www.diabetes.co.uk/hba1c-to-blood-sugar-level-converter.html

My last HbA1c was 7.3% which according to the calculator was an average BG reading of 9.0 mmol/L!
Read that again, an AVERAGE of 9.0.

I have been stressing over my Freestyle Libre readings giving an average of 7.0 mmol/L and just not believing the estimated HbA1c.
Currently showing estimated 5.7% which is lower than I have ever achieved since diagnosis.
Now I don't believe that calculation, but I do believe my Freestyle Libre to be within one full unit of accuracy (sometimes high, often low, but not that far out).

An average of 7.8 mmol/L would give me a more or less expected 6.5% HbA1c.

So now I don't know if I am worrying unduly or if the Freestyle Libre is giving me false hope.

Can I have just one sweetie now?

Oh, and do other Libre users find the estimate anywhere near the HbA1c blood test readings?

 

[Rokaab]

I know for myself it always showed lower than I actually was, upto 2 mmol/L below (but it was pretty consistent throughout the life of each sensor for me so I could tell what I was). It was also very inaccurate when it thought I was low - So I never bothered to look at the estimated HbA1

 

[Antje77]

My Libre-estimated hba1c has been consistently lower by 8 mmol/mol (0,8% I believe) over the last 3 years.
This fits the difference between fingerpricks and Libre scans: Libre usually reads lower than blood by 0.8 to 1.8 mmol/l for me.

Reading around on different Facebook groups it seems that for some the Libre estimate is very close to a lab hba1c while for others it's off.
The same goes for day to day glucose: some find the Libre is accurate, others, like me, find it reads lower or higher than blood.

We have a couple of members using third party apps instead of the official LibreLink app. Those unofficial apps can be calibrated to fingerpricks, supposedly making the Libre results more trustworthy. @Jaylee for one likes it, but I didn't. I tried but it just confused me so I went back to the official app.

 

[Bluetit1802]

I haven't used a Libre for some time, but I did use them for a few years, and ALWAYS the estimated HbA1c was a lot lower than my actual lab tested one, even though the Libre readings weren't too far off my meter readings. I just ignored it.

 

[Jaylee]

My Libre-estimated hba1c has been consistently lower by 8 mmol/mol (0,8% I believe) over the last 3 years.
This fits the difference between fingerpricks and Libre scans: Libre usually reads lower than blood by 0.8 to 1.8 mmol/l for me.

Reading around on different Facebook groups it seems that for some the Libre estimate is very close to a lab hba1c while for others it's off.
The same goes for day to day glucose: some find the Libre is accurate, others, like me, find it reads lower or higher than blood.

We have a couple of members using third party apps instead of the official LibreLink app. Those unofficial apps can be calibrated to fingerpricks, supposedly making the Libre results more trustworthy. @Jaylee for one likes it, but I didn't. I tried but it just confused me so I went back to the official app.

Hi,

I do use an app with a Bluetooth bridge to my Libre that I can calibrate to my meter.
But the meter's calibration is consistently 15% higher than most NHS meter's issued to nurses?
I'm happy with the graph within 0.6mmol to my meter.
Strangely both A1c calculations on the Xdrip app & the Diaconnect app romp in about 15% higher than the figure that comes back from the lab? Regarding my personal experience.
My current Libre is behaving quite well. Though I check quite often against the meter. I haven't needed to calibrate the sensor in 3or 4 days..

 

[becca59]

I have never looked at the estimation to be honest. The actual blood test is what counts. And am now less worried about the HBA1C and more concerned-proactive about the time in range. A good HBA1C should then follow. This time round the TIR and above and below are what interested my consultant. Wild fluctuations may give a good HBA1C but are not necessarily what’s healthy. With the arrival of all this fantastic new technology, thinking on diabetes evaluation is changing I think.