We found seven studies comparing blood glucose levels
at specific times of the day with HbA1c levels, showing
that postprandial blood glucose values were more closely
associated with HbA1c levels.96–102 However, the strongest
correlation was observed between HbA1c and MPG levels.
Four cohort studies of patients with diabetes have
compared overall MBG levels with HbA1c.77,103–105 All but
one105 were limited to T1DM. Study periods ranged from
1–6 months and frequency of blood glucose measurement
ranged from two to four times per day