High blood glucose level against hba1c

[NewbieHelp]

Hoping some knowledgeable person will know the answer to this ….

My own BS this morning was 7.9 but on researching on Google … I came across a chart that said 7.9 would indicate a Hba1c of 6.6/49

So my question, hypothetically, if my blood sugars stayed at 7.9 for 3 month's and didn’t fluctuate ( I know that’s not possible) would by Hba1c be 6.6 or 7.9?

This came up as a result of a Google search after talking to a friend who’s T2 elderly relative has LS a blood sugar level of 26…

 

[urbanracer]

Hoping some knowledgeable person will know the answer to this ….

My own BS this morning was 7.9 but on researching on Google … I came across a chart that said 7.9 would indicate a Hba1c of 6.6/49

So my question, hypothetically, if my blood sugars stayed at 7.9 for 3 month's and didn’t fluctuate ( I know that’s not possible) would by Hba1c be 6.6 or 7.9?

This came up as a result of a Google search after talking to a friend who’s T2 elderly relative has LS a blood sugar level of 26…

Hi @NewbieHelp
Because HbA1c is an average over the past 2 to 3 months it cannot be deduced from any single reading. Therefore you shouldn't really read backwards from a single glucose reading and try and use it to deduce a HbA1c number.
If your blood glucose level was 7.9 for 100 readings then your calculated average would be 7.9x100/100 = 7.9, but HbA1c is actually determined from the length of glucose chains attached to hemoglobin molecules so it doesn't necessarily follow the arithmetic average although there is often a correlation.

 

[searley]

Hoping some knowledgeable person will know the answer to this ….

My own BS this morning was 7.9 but on researching on Google … I came across a chart that said 7.9 would indicate a Hba1c of 6.6/49

So my question, hypothetically, if my blood sugars stayed at 7.9 for 3 month's and didn’t fluctuate ( I know that’s not possible) would by Hba1c be 6.6 or 7.9?

This came up as a result of a Google search after talking to a friend who’s T2 elderly relative has LS a blood sugar level of 26…

There is no way to be anywhere near accurate from a single reading.. in fact even 6 or 7 readings a day can still yeald unexpected results

It's not unusual for readings in the first hours or so of the day to be higher than normal due to a liver dump this is typically known as dawn phenomenon

Readings day to day could also vary dramatically. So personally I wouldn't even start to worry about hba1c levels from a small handful of tests.. especially morning readings

 

[KennyA]

Hoping some knowledgeable person will know the answer to this ….

My own BS this morning was 7.9 but on researching on Google … I came across a chart that said 7.9 would indicate a Hba1c of 6.6/49

So my question, hypothetically, if my blood sugars stayed at 7.9 for 3 month's and didn’t fluctuate ( I know that’s not possible) would by Hba1c be 6.6 or 7.9?

This came up as a result of a Google search after talking to a friend who’s T2 elderly relative has LS a blood sugar level of 26…

Hi

As well as what folks have said above, the HbA1c tests, CGM readings, and the fingerprick tests (and the blood draw that goes off to the lab for that matter) are all testing different things in different ways. HbA1c (in mmol/mol) is looking at numbers of glycated red blood cells, CGMs read interstitial fluid, fingerprick tests (in mmol/l) use capilliary blood, and the blood draw is normally venous blood. Each of the tests has some level of inaccuracy. So they're testing different things in different ways, and (eg) for the fingerprick tests you only get a snapshot at the point you test - things could change a lot in half an hour, and you've no way of knowing what happens when you're not testing.

I tried to do the estimate/average thing five years ago, it just didn't work. The charts are misleading - it looks like the mmol/mol and mmol/litre figures are sort of "equivalents" and they aren't. In retrospect, though, what my fingerprick tests (before eating and at +2hrs) showed was a general trend downwards, higher readings gradually disappearing, lower readings becoming more and more common. That's the important info, rather than trying to guesstimate what the next HbA1c might be. I've read posts from people who've done very well reducing their HbA1c, but they are disappointed with a good result because it wasn't what they'd "averaged" it at and hoped it would be.