A1C Test: Average Blood Sugar Over Three Months
The hemoglobin A1C test estimates your average blood glucose over the previous two to three months. It is used to screen for prediabetes and diabetes and to monitor long-term glucose control in people who already have diabetes. Results are reported as a percentage, and common reference points are below 5.7 percent for normal, 5.7 to 6.4 percent for prediabetes, and 6.5 percent or higher for diabetes. The test needs no fasting and can be collected at any time of day, which makes it a convenient option for a walk-in visit.
Key Takeaways
- A1C reflects average blood glucose over roughly two to three months rather than a single moment.
- It is used to screen for prediabetes and diabetes and to monitor long-term control.
- Results are reported as a percentage; common reference points are below 5.7, 5.7 to 6.4, and 6.5 percent or higher.
- The test does not require fasting and can be drawn at any time of day.
- A single result outside the reference range should be discussed with a clinician, who may repeat it.
Frequently Asked Questions
Do I need to fast for an A1C test?
No. The A1C test does not require fasting and can be collected at any time of day.
How often should A1C be checked?
Frequency depends on your situation. People with diabetes often check it a few times a year, while screening for prediabetes may happen less often. A clinician can advise.
Can I order an A1C test without a doctor?
Yes. A1C is commonly available through direct-access testing. You can order it online and visit a walk-in collection site.
What can affect an A1C result?
Conditions that change red blood cell lifespan, such as some anemias, recent transfusions, or certain hemoglobin variants, can affect the result. Tell the lab about them.
Sources
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