How to Prepare for an HbA1c Test
A simple guide on what to know before having an HbA1c blood test and how to understand the result.
What you can do
Before the test
- HbA1c testing generally does not require fasting.
- Take your usual medicines unless your clinician has instructed you otherwise.
- Drink water normally.
- Inform the healthcare provider about any medicines or medical conditions you have. During the test
- A small blood sample is collected, usually from a vein in your arm.
- The sample is sent to the laboratory for analysis.
- The procedure usually takes only a few minutes. After the test
- You can generally return to your normal activities immediately.
- Follow your clinician's instructions on when and how to receive the result.
- Do not change your diabetes medication based on the result without discussing it with your healthcare provider. Understanding the result HbA1c reflects your average blood glucose over approximately the previous 2 to 3 months. Results are commonly interpreted as:
- Below 5.7%: generally considered normal
- 5.7%–6.4%: generally considered the prediabetes range
- 6.5% or higher: in the diabetes range The result should be interpreted together with your symptoms, medical history and other investigations.
