Numerous organizations support the ICFF method to report HA1c over the DCCT method. Most of Europe and UK use ICFF now. It's a good standard. Easy to work with and understand.
Typically HA1c values will be between 30 and 100. Really nice numbers are in the 40's. The lower the better, of course, just like with the DCCT method. It's probably difficult for non-US people to imagine that this method looks strange to most people in US. It's just a matter of what one is familiar with.
Conversion between DCCT and IFCC is by the following equation:
IFCC-HbA1c (mmol/mol) = 11 x [DCCT-HbA1c (%) - 2.15], and then round off with no decimal place needed. The final value doesn't need more than two significant figures for most people in ordinary use.
Example. My HA1c on my last blood labs was 7.0% given in the DCCT dimension. So this works out using the above formula to equal 53 in the ICFF method. Actually, my paperwork from routine ordinary blood labs (done at Quest Diagnostics, a big chain) prints both methods.
You ready for the change?