A hemoglobin A1c (aka HbA1c or A1c) level of 5.1 is considered optimal. A hemoglobin A1c (aka HbA1c or A1c) level of 5.2 is considered optimal. A1c levels between 4 and 5.6 percent indicate good blood glucose control over the last 2-3 months.
Figure 5.15 from A study on influence of iron deficiency anaemia over HbA1c levels
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