A review on Tests of Glycaemia in diabetes recommended that
laboratories should use a HbA1c assay method with an intralaboratory
coefficient of variation (CV) of < 4% (ideally < 3%) and
that laboratories should provide basic information about the assay
method including type of assay method, non-diabetic reference
range, potential assay interference, and assay performance (e.g.,
some measure of assay imprecision, such as CV