how to calculate hba1c from fasting blood sugar

The HbA1c (Hemoglobin A1c) test measures your average blood sugar levels over the past 2-3 months, while fasting blood sugar (FBS) measures your blood glucose level after an overnight fast. There is no direct formula to convert fasting blood sugar to HbA1c, as they measure different aspects of glucose control. However, you can estimate the relationship between HbA1c and average blood glucose levels using the following table:

HbA1c (%) Estimated Average Glucose (mg/dL)

6 126
7 154
8 183
9 212
10 240

For example, an HbA1c of 7% corresponds to an estimated average glucose level of 154 mg/dL. This table is based on the ADAG (A1C-Derived Average Glucose) study and is widely used for clinical purposes.

If you need to estimate HbA1c from fasting blood sugar, consult your healthcare provider for a more accurate assessment, as individual factors like diet, exercise, and medication can influence these values.