A value for hemoglobin A1c is affected by the units and the reference standard.
Convention
Units
US
percent
SIU
mmol/mold
value1 in percent =
= (value2 in mmol/mol) / 10
value 2 in mmol/mol =
= 10 * (value1 in percent)
In addition, the reference standard used by the U.S. National Glycohemoglobin Standardization Program (NGSP) differs from that proposed by the International Federation of Clinical Chemistry and Laboratory Medicine (IFCC).
US NGSP
IFCC
5%
3.3%
6%
4.2%
7%
5.3%
8%
6.4%
IFCC value in percent =
= (1.040 * (NGSP value in percent)) - 1.96
NGSP value in percent =
= (0.96 * (IFCC value in percent)) + 1.885
If the US adopts the IFCC standard, then this need to adjust values would cease.
To read more or access our algorithms and calculators, please log in or register.
