How is HbA1c calculated? Expert explains what your blood sugar test really means

Your HbA1c number can tell a different story from a single sugar readingHbA1c, or Hemoglobin A1C (HbA1C) Test, is a simple blood test that measures your average blood sugar levels over the past two to three months, but it is not calculated by taking an average of your fasting and post-meal sugar readings.