Lab test
Hemoglobin A1C Testing
Below is a plain-language overview of the hemoglobin a1c testing. Hemoglobin A1C testing provides a picture of your average blood sugar levels over the past two to three months. It is a key test for managing diabetes.
What this test is
This test measures the amount of glycated hemoglobin in your red blood cells. Glycation occurs when sugar in the bloodstream attaches to hemoglobin.
What it measures
- Hemoglobin A1C — reflects average blood glucose control over 2-3 months
What the test involves
A standard blood draw from a vein in your arm is typically required for this test. The collected blood sample is then sent to a laboratory for analysis.
Why it is often ordered
Clinicians often order this test to help diagnose prediabetes and diabetes. It is also used to monitor how well treatment plans are working for individuals with diabetes.
Preparation
No special preparation is usually needed for this test. Always follow any specific instructions provided by the laboratory where you will have your sample collected.
How results are reported
Your results will indicate your average blood sugar level over a period of time. Reference ranges can vary between laboratories, so discuss your results with your healthcare provider.
Before you go
- Test availability
- Specific preparation instructions
- How to schedule your appointment
FAQ
Frequently asked questions
How is Hemoglobin A1C different from a regular blood sugar test?
A regular blood sugar test shows your glucose level at a single point in time. Hemoglobin A1C provides a longer-term average, showing your glucose control over the previous two to three months.
Can I eat or drink before my Hemoglobin A1C test?
Generally, you do not need to fast for a Hemoglobin A1C test. However, it is always best to confirm fasting requirements with the specific laboratory performing the test.
How often should I have this test done?
The frequency of Hemoglobin A1C testing depends on your individual health status and your healthcare provider's recommendations. For those managing diabetes, it is often done every three to six months.
What do the A1C results mean?
Results are reported as a percentage. Higher percentages generally indicate higher average blood sugar levels. Your healthcare provider will interpret your specific results in the context of your health.
Related
Related tests
Locations
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