Guide · By DueTrack Studio · Updated 2026-10-29
A1C levels explained: what your number means
The A1C test shows your average blood sugar over roughly the past three months. According to the CDC, an A1C below 5.7% is normal, 5.7% to 6.4% indicates prediabetes, and 6.5% or higher indicates diabetes. Your doctor interprets your result and sets your personal target.
What does the A1C test measure?
It measures the percentage of haemoglobin with glucose attached, which reflects average blood sugar over about the previous two to three months. It does not replace daily readings, which show day-to-day changes.
What are the CDC A1C ranges?
- Normal: below 5.7%.
- Prediabetes: 5.7% to 6.4%.
- Diabetes: 6.5% or higher.
How do daily habits relate to A1C?
Because A1C reflects an average, everyday patterns — meals, activity, sleep and medicines — all feed into it. Tracking readings and habits together helps you and your doctor see what is changing.
What should you do with your result?
Discuss it with your doctor. They will consider your health history and may set a different target from the general ranges.
Questions
My A1C came back 6.0. What does that mean?
By the CDC ranges, 5.7% to 6.4% is in the prediabetes range. Talk to your doctor about what it means for you and what to do next.
How often is A1C tested?
Your doctor decides. It reflects about three months, so it is not usually repeated more often than that.