Different Calculations of mmol/mol

reprobate · Dec 21, 2016

Hi , I have only recently started blood glucose testing in order to help regulate blood sugar preparatory to an operation. I have noticed that the NHS chart figures when converting average blood readings in mmol/L to mmol/mol (IFCC standardised) are considerably different from Diabetes Uk chart figures. For example an average blood sugar level of 6.8 mmol/L converts to 51 on the NHS chart, but only 41 on the Diabetes UK chart, quite a major difference Can anybody tell me why, and which is more accurate. Thanks

GrantGam · Dec 21, 2016

reprobate said:
Hi , I have only recently started blood glucose testing in order to help regulate blood sugar preparatory to an operation. I have noticed that the NHS chart figures when converting average blood readings in mmol/L to mmol/mol (IFCC standardised) are considerably different from Diabetes Uk chart figures. For example an average blood sugar level of 6.8 mmol/L converts to 51 on the NHS chart, but only 41 on the Diabetes UK chart, quite a major difference Can anybody tell me why, and which is more accurate. Thanks

6.8mmol/l (average BG) works out at roughly 41mmol/mol (HbA1c). That much is true.

6.8% DCCT (HbA1c) converts to 51mmol/mol (HbA1c) both units of measurement representing HbA1c.

Does that make sense? It's kind of tricky to word. Basically:

6.8% DCCT converts to 51mmol/mol IFCC

6.8mmol/l converts to 41mmol/mol

reprobate · Dec 22, 2016

GrantGam1337 said:
6.8mmol/l (average BG) works out at roughly 41mmol/mol (HbA1c). That much is true.

6.8% DCCT (HbA1c) converts to 51mmol/mol (HbA1c) both units of measurement representing HbA1c.

Does that make sense? It's kind of tricky to word. Basically:

6.8% DCCT converts to 51mmol/mol IFCC

6.8mmol/l converts to 41mmol/mol

Thanks very much. That shows me that I have been looking at the conversion Charts wrongly. The "50 Shades of Diabetes " chart from Diabetes UK clearly show the comparative conversion between 4 different readings, (mmol/L; mg/dL; IFCC; & DCCT. ) whereas the NHS charts I have are simply a comparison between the two different HbA1c measurements.
I have kept a very accurate record of my mmol/L readings over the last three months leading up to my latest NHS test, and the Diabetes UK chart indicates that I should be around 51 on the HbA1c IFCC scale whereas my NHS result is putting me at 64. Even allowing for. say, 10% discrepancy in my own readings (3 per day over the period), I cannot reconcile the two figures.
Fortunately the NHS reading is still low enough to enable Surgery, so good result there. I will keep looking for an NHS comparison Chart which shows the actual conversion I need

Thanks again.

bulkbiker · Dec 22, 2016

reprobate said:
Thanks very much. That shows me that I have been looking at the conversion Charts wrongly. The "50 Shades of Diabetes " chart from Diabetes UK clearly show the comparative conversion between 4 different readings, (mmol/L; mg/dL; IFCC; & DCCT. ) whereas the NHS charts I have are simply a comparison between the two different HbA1c measurements.
I have kept a very accurate record of my mmol/L readings over the last three months leading up to my latest NHS test, and the Diabetes UK chart indicates that I should be around 51 on the HbA1c IFCC scale whereas my NHS result is putting me at 64. Even allowing for. say, 10% discrepancy in my own readings (3 per day over the period), I cannot reconcile the two figures.
Fortunately the NHS reading is still low enough to enable Surgery, so good result there. I will keep looking for an NHS comparison Chart which shows the actual conversion I need

Thanks again.

When were you taking your 3 readings per day? before or after food?

Bluetit1802 · Dec 22, 2016

reprobate said:
I will keep looking for an NHS comparison Chart which shows the actual conversion I need

Thanks again.

There is no need to keep looking for such a chart. Use the Diabetes.co.uk one. It is correct. It is a mathematical calculation and will be the same on any chart you find, but be careful about anticipating your HbA1c result from just a few finger prick tests. You may be disappointed if you haven't been catching all your peaks.

GrantGam · Dec 22, 2016

reprobate said:
the Diabetes UK chart indicates that I should be around 51 on the HbA1c IFCC scale whereas my NHS result is putting me at 64.

Can you provide a link to this NHS chart that you're looking at please? I'm confident that the NHS and DUK "charts" are both the same and you are just interpreting them wrongly...

Bluetit1802 · Dec 22, 2016

GrantGam1337 said:
Can you provide a link to this NHS chart that you're looking at please? I'm confident that the NHS and DUK "charts" are both the same and you are just interpreting them wrongly...

No. The NHS chart he is referring to is a simple conversion from the old HbA1c units (%) to the new ones (mmol/mol) It doesn't attempt to convert to mmol/l

GrantGam · Dec 22, 2016

Bluetit1802 said:
No. The NHS chart he is referring to is a simple conversion from the old HbA1c units (%) to the new ones (mmol/mol) It doesn't attempt to convert to mmol/l

Can someone please show me this infamous "chart" then, as every NHS conversion table or whatever you want to call it seems accurate enough to me.

https://www.google.co.uk/url?sa=t&s...EQdkYKJ7OQ3TvwLtA&sig2=Ik62Qv28pv0KiTltrG0d1A

https://www.google.co.uk/url?sa=t&s...NNkYYtd247EdkfzVg&sig2=XQYUNfTtaGBUr5dpCrfxuQ

Is the OP even talking about a chart anyway or does he/she mean that their actual HbA1c blood test result differs from their own estimate from meter readings?

Bluetit1802 · Dec 22, 2016

GrantGam1337 said:
Can someone please show me this infamous "chart" then, as every NHS conversion table or whatever you want to call it seems accurate enough to me.

https://www.google.co.uk/url?sa=t&s...EQdkYKJ7OQ3TvwLtA&sig2=Ik62Qv28pv0KiTltrG0d1A

https://www.google.co.uk/url?sa=t&s...NNkYYtd247EdkfzVg&sig2=XQYUNfTtaGBUr5dpCrfxuQ

Is the OP even talking about a chart anyway or does he/she mean that their actual HbA1c blood test result differs from their own estimate from meter readings?

Neither of those two charts you linked to have conversions to mmol/l which is what the OP is looking for on an NHS site. The DCUK chart does convert from mmol/mol to mmol/l and that is what he is looking for.
http://www.diabetes.co.uk/hba1c-to-blood-sugar-level-converter.html

GrantGam · Dec 22, 2016

Bluetit1802 said:
Neither of those two charts you linked to have conversions to mmol/l which is what the OP is looking for on an NHS site. The DCUK chart does convert from mmol/mol to mmol/l and that is what he is looking for.
http://www.diabetes.co.uk/hba1c-to-blood-sugar-level-converter.html

I must be misreading the post. As long as the OP has the answers they need then that's all that matters.

Sid Bonkers · Dec 22, 2016

You cant readily convert HbA1c to home tested bg levels, at best you can calculate an average but an average will rarely be comparable to individual tests.

Different Calculations of mmol/mol

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