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Hemoglobin A1C

Learn more about the Hemoglobin A1C test, when it can be used, the interpretation of the results, and more with our short guide.

Patricia Buenaventura avatar

By Patricia Buenaventura on Aug 2, 2025.

Fact Checked by Ericka Pingol.

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Commonly asked questions

The HbA1c test is a routine lab test that requires a blood sample, typically obtained via a small blood draw from the patient’s arm. It does not require fasting, making it more convenient than other blood glucose tests. This simplicity allows for integration into regular check-ups or diabetes screening appointments.

The HbA1c test measures the percentage of glycated hemoglobin in the patient’s blood, providing a snapshot of their average blood glucose levels over the past 2–3 months. It’s an essential tool for identifying how well blood sugar is controlled, whether low blood glucose is an issue, and for determining when diabetes develops. By showing how much glucose attaches to hemoglobin, the test helps guide treatment and assess the risk of complications.

The HbA1c test is a cornerstone for diagnosing and monitoring diabetes. It provides a clear picture of blood sugar control without requiring multiple daily measurements, making it an efficient alternative to other lab tests. Additionally, it identifies early indicators of prediabetes, ensuring timely intervention before diabetes develops. By offering long-term insights, the test helps healthcare professionals tailor treatment plans, adjust medications, and prevent complications.

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