HbA1c (A1c): What It Means and Your Target Range

Last updated: June 2026 - Reviewed by the Apexzen editorial team

Part of: Blood Biomarkers Guide

What is HbA1c? Hemoglobin A1c measures the share of your hemoglobin (the oxygen-carrying protein in red blood cells) that has glucose attached to it. Because red blood cells live for a few months, A1c gives a longer-term picture of blood sugar than a single fasting glucose reading. It is widely used to screen for and monitor diabetes, and it is reported as a percentage.

Optimal and reference range

The figures below are typical lab reference ranges, which vary by lab and individual. Your own report's range is the one that counts, and your personal target may differ. Discuss your results with your doctor or clinician.

Ranges vary by lab and individual; discuss your results with your doctor.

What affects A1c and what helps

Lifestyle has a real influence on A1c over time, under a clinician's guidance:

• Build meals around vegetables, whole grains, legumes, lean protein, and healthy fats, and limit sugary drinks and refined carbs.
• Be active most days; regular movement helps your body use glucose.
• Work toward a weight your doctor recommends, since even modest weight loss can help.
• Prioritize sleep and stress management, both of which affect blood sugar.

Because A1c reflects months of blood sugar, changes show up gradually, and your doctor will usually retest after a few months to track progress.

When to talk to your doctor

See your doctor if your A1c falls in the prediabetes or diabetes range, or if you have risk factors such as family history, excess weight, or high blood pressure. Your clinician can confirm the result, set a personal target, and decide whether lifestyle changes alone or additional treatment are appropriate.

Frequently asked questions

What is a normal A1c?

Below 5.7 percent is generally considered normal, with 5.7 to 6.4 percent in the prediabetes range. These are typical lab reference values that vary by lab and individual, and your doctor sets your personal target.

How often should A1c be checked?

It depends on your situation. People without diabetes may be screened periodically, while those managing blood sugar are often retested every few months. Your doctor will advise on timing.

Can a supplement lower my A1c?

No supplement is a substitute for medical care. A1c responds to diet, activity, weight, sleep, and any prescribed treatment. Discuss any plan with your doctor.

Related reading: Dangerous Blood Sugar Levels and Blood Biomarkers Guide.

Sources: Centers for Disease Control and Prevention (CDC); National Institutes of Health (NIH) - A1c and diabetes guidance.

This article is for educational purposes only and is not medical advice. These statements have not been evaluated by the Food and Drug Administration. Apexzen products are not intended to diagnose, treat, cure, or prevent any disease. Always consult a qualified healthcare provider before changing your diet, supplements, or treatment.