A1c is a blood test that
checks the amount of sugar (glucose) bound to
hemoglobin . The result is shown as a percentage. The
result of your A1c test can also be used to estimate your average blood sugar
level. This is called your estimated average glucose, or eAG. Your doctor will have your test results in a few days.
The American Diabetes Association (ADA) criteria to diagnose diabetes includes the option of testing A1c. The diagnosis of diabetes needs to be confirmed by repeating the same blood sugar test or doing a different test on another day.
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what's normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
Less than 5.7%
|Prediabetes (increased risk for diabetes) |
6.5% and higher
The ADA recommends that most nonpregnant adults who have diabetes have an A1c level less than 7%.2 Talk to your doctor about your diabetes treatment plan and your target A1c goal.
A1c and estimated average glucose (eAG) 2
| A1c % ||Estimated average
plasma glucose (mg/dL) ||Estimated average plasma glucose (mmol/L)|
|6% || |
|7% || |
|8% || |
|9% || |
|10% || |
|11% || |
|12% || |
A1c recommendations for children and teens 2
|Age ||A1c %|
|Children younger than 6
years old ||Less than 8.5%|
|Children ages 6–12 years
old ||Less than 8%|
|Teens ages 13–19 years
old ||Less than 7.5%|
Some medical conditions can increase A1c levels, but the
results may still be within a normal range. These conditions include
polycystic ovary syndrome (PCOS).
Corticosteroid treatment increases the A1c
A1c levels may be higher in children and adolescents with