how long does a1c measure

The A1C test measures your average blood sugar levels over the past 2 to 3 months. This is because red blood cells, which carry hemoglobin (the protein that glucose attaches to), have a lifespan of about 3 months. The test provides a percentage that reflects the amount of glucose-coated hemoglobin in your blood, giving a long-term view of your blood sugar control.

For example:

• Normal A1C: Below 5.7%
• Prediabetes: 5.7% to 6.4%
• Diabetes: 6.5% or above

This test is particularly useful for diagnosing diabetes, monitoring treatment effectiveness, and assessing long-term blood sugar management.