What is considered a normal A1C level?

For most adults, values below 5.7% are considered normal. Levels from 5.7% to 6.4% indicate prediabetes, while 6.5% or higher suggests diabetes when confirmed by laboratory testing.

What does the A1C test measure?

The test measures the percentage of hemoglobin in red blood cells that has glucose attached, reflecting average blood sugar exposure over the previous 2–3 months.

How far back does the test reflect blood sugar?

Results reflect glucose levels over approximately 8–12 weeks, with greater weight given to the most recent 30 days.

Why might lab results differ from daily readings?

Daily readings show immediate glucose values, while lab results reflect a long-term average. Short-term fluctuations may not significantly affect the overall result.

Can A1C be estimated at home?

Estimates can be calculated using average glucose data from your glucometer's history or the A1C calculator (educational use) , but laboratory testing remains the standard for diagnosis and treatment decisions.