A1c Chart Explained: Understanding Your Levels for Prediabetes and Diabetes

23 Aug 2025

A1c Chart Explained: Understanding Your Levels for Prediabetes and Diabetes Understanding your A1c levels is crucial for managing your health, especia...

A1c Chart Explained: Understanding Your Levels for Prediabetes and Diabetes

Understanding your A1c levels is crucial for managing your health, especially if you are at risk for or have been diagnosed with prediabetes or diabetes. This article provides a detailed explanation of the A1c chart, what the different levels mean, and what steps you can take to maintain healthy blood sugar levels.

What is the A1c Test?

The A1c test, also known as the hemoglobin A1c test or glycated hemoglobin test, is a blood test that measures your average blood sugar levels over the past 2-3 months. Unlike a fasting blood glucose test, which gives you a snapshot of your blood sugar at a specific moment, the A1c test provides a broader picture of your blood sugar control over time. It measures the percentage of your red blood cells that have glucose attached to them. The higher your blood sugar levels, the more glucose will be attached to your hemoglobin.

The A1c test is a primary diagnostic tool for type 2 diabetes and is also used to monitor how well people with diabetes are managing their condition. It helps healthcare providers and patients make informed decisions about treatment plans and lifestyle adjustments.

The A1c Chart: Ranges and Interpretations

The A1c chart provides a clear guideline for understanding your blood sugar control. Here's a breakdown of the different ranges and what they mean:

Related reading: Prediabetes Range Explained What Your A1C And Fasting Glucose Mean

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

Let’s delve deeper into each category.

Normal A1c Level (Below 5.7%)

An A1c level below 5.7% is considered normal and indicates that your average blood sugar levels are within a healthy range. However, it's still important to maintain a healthy lifestyle, including regular exercise and a balanced diet, to prevent the development of prediabetes and diabetes in the future. Regular check-ups and monitoring can help you stay proactive about your health.

Prediabetes A1c Level (5.7% to 6.4%)

If your A1c level falls between 5.7% and 6.4%, you are diagnosed with prediabetes. This means that your blood sugar levels are higher than normal but not high enough to be diagnosed with diabetes. Prediabetes is a serious condition because it increases your risk of developing type 2 diabetes, heart disease, and stroke.

However, the good news is that prediabetes can often be reversed through lifestyle changes. By adopting a healthier diet, increasing physical activity, and losing weight (if you are overweight), you can lower your blood sugar levels and reduce your risk of progressing to type 2 diabetes.

Diabetes A1c Level (6.5% or Higher)

An A1c level of 6.5% or higher indicates that you have diabetes. This means that your average blood sugar levels are consistently high, which can lead to serious health complications over time, including:

  • Heart disease
  • Kidney disease
  • Nerve damage (neuropathy)
  • Eye damage (retinopathy)
  • Foot problems

If you are diagnosed with diabetes, it's important to work closely with your healthcare provider to develop a comprehensive treatment plan that may include lifestyle changes, medication, and regular monitoring of your blood sugar levels.

Related reading: The Best Blood Sugar Friendly Meals For All Day Energy

A1c and Estimated Average Glucose (eAG)

The A1c level is directly related to your estimated average glucose (eAG), which is an estimate of your average blood sugar level in mg/dL (milligrams per deciliter). You can use an A1c to eAG calculator to convert your A1c level to an eAG value and vice versa. This conversion can help you better understand your blood sugar control and how it relates to your daily glucose readings.

Here's a table showing common A1c levels and their corresponding eAG values:

A1c (%) Estimated Average Glucose (eAG) (mg/dL) Estimated Average Glucose (eAG) (mmol/L)
6% 126 7.0
7% 154 8.6
8% 183 10.1
9% 212 11.8
10% 240 13.4
11% 269 14.9
12% 298 16.5

Factors That Can Affect A1c Results

While the A1c test is generally accurate, certain factors can affect the results. These include:

  • Anemia: Conditions that affect red blood cell turnover can impact A1c readings.
  • Kidney disease: Kidney problems can sometimes lead to inaccurate A1c results.
  • Hemoglobin variants: Certain genetic variations in hemoglobin can interfere with the test.
  • Pregnancy: A1c levels may be lower during pregnancy due to increased red blood cell turnover.

It’s crucial to inform your healthcare provider about any health conditions or medications you are taking, as they may influence the interpretation of your A1c results.

What to Do With Your A1c Results

Once you receive your A1c results, it’s essential to discuss them with your healthcare provider. Here’s a general guide based on the ranges mentioned earlier:

  • Normal (Below 5.7%): Continue to maintain a healthy lifestyle. Regular check-ups are still recommended.
  • Prediabetes (5.7% to 6.4%): Implement lifestyle changes like diet modification and exercise to lower your blood sugar. Your doctor may recommend regular monitoring and retesting.
  • Diabetes (6.5% or Higher): Work with your healthcare provider to create a comprehensive treatment plan. This may include lifestyle changes, medication, and consistent monitoring.

Lowering Your A1c Levels: Practical Steps

If your A1c level is higher than the normal range, there are several steps you can take to lower it and improve your blood sugar control:

  1. Diet Modification: Focus on a balanced diet that is low in added sugars, refined carbohydrates, and unhealthy fats. Emphasize whole grains, lean proteins, fruits, and vegetables.
  2. Regular Exercise: Aim for at least 150 minutes of moderate-intensity aerobic exercise per week, such as brisk walking, jogging, or cycling.
  3. Weight Management: If you are overweight or obese, losing even a small amount of weight can significantly improve your blood sugar levels.
  4. Medication Adherence: If your doctor prescribes medication to manage your diabetes, take it as directed and follow up regularly to monitor its effectiveness.
  5. Stress Management: High stress levels can raise blood sugar. Practice relaxation techniques like meditation, yoga, or deep breathing exercises to manage stress.
  6. Regular Monitoring: Monitor your blood sugar levels regularly using a home glucose meter and keep track of your readings to help you and your healthcare provider make informed decisions about your treatment plan.

The Importance of Regular A1c Testing

Regular A1c testing is an essential part of managing diabetes and prediabetes. It allows you to track your progress, make necessary adjustments to your treatment plan, and prevent or delay the onset of serious complications.

  • For people with diabetes: The American Diabetes Association recommends that most people with diabetes have an A1c test at least twice a year.
  • For people with prediabetes: If you have prediabetes, your healthcare provider may recommend getting tested more frequently, especially if you are making lifestyle changes to lower your blood sugar levels.
  • For people with normal A1c: Screening may be recommended every 3 years, especially for those who are overweight or have a family history of diabetes.

In Conclusion

Related reading: The Beginner S Guide To Managing Your Blood Glucose Levels

Understanding your A1c levels is a key step in managing your blood sugar and preventing diabetes complications. By understanding the A1c chart, knowing your risk factors, and adopting healthy lifestyle habits, you can take control of your health and live a longer, healthier life. Regular A1c testing, combined with ongoing collaboration with your healthcare provider, is essential for achieving and maintaining optimal blood sugar control.