Science Fair Project Encyclopedia The HbA1c level is
proportional to average blood glucose concentration over the
previous two to four weeks (it was previously thought to average
over approximately three months). The mapping between HbA1c and
blood glucose average is shown in the table below. |A1C
(%)||Avg. Blood Sugar (mg/dl)| Endocrinologists currently
believe that HbA1c values below 6.5% (American College of
Endocrinology: The AACE System of Intensive Diabetes Self-
Management — 2002 Update) are acceptable and indicate good
control; normal is 3-6%. Interpreting results is somewhat
difficult because (1) laboratory results can differ depending on
the analytical technique and (2) biological variation between
individuals can be up to 1% (i.e. two individuals with the same
average blood sugar can have A1C values that differ by up to
1%). The contents of this article is licensed from
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