A1C
The A1C test (HbA1c test) is a blood test that measures the average level of blood glucose (sugar) over the past 2 to 3 months by determining the percentage of hemoglobin that has glucose attached to it. It is commonly used to diagnose and monitor diabetes.
The A1C test, also called the HbA1c test, hemoglobin A1c test, or glycated hemoglobin test, is a laboratory blood test that reflects a person's average blood glucose levels over approximately the previous 2 to 3 months. The test measures the percentage of hemoglobin, the oxygen-carrying protein in red blood cells, that has become attached to glucose. Since red blood cells typically survive for about 120 days, HbA1c provides a longer-term picture of blood sugar control compared with a single glucose measurement. The A1C test is used to diagnose prediabetes and diabetes and to monitor how well blood glucose is being controlled in people with diabetes. Higher A1C values indicate higher average blood glucose levels and may be associated with an increased risk of diabetes-related complications affecting the eyes, kidneys, nerves, and cardiovascular system. Certain conditions affecting red blood cells or hemoglobin may influence test accuracy.
The A1C test is a blood test that shows your average blood sugar level over the last few months. It helps doctors diagnose diabetes and check how well a person's diabetes treatment plan is working.
• Also called HbA1c, hemoglobin A1c, or glycated hemoglobin test • Measures average blood glucose levels over the past 2–3 months • Works by measuring the percentage of hemoglobin attached to glucose • Used to diagnose diabetes and prediabetes • Helps monitor long-term blood sugar control in people with diabetes • General A1C ranges: - Normal: Below 5.7% - Prediabetes: 5.7% – 6.4% - Diabetes: 6.5% or higher (based on diagnostic criteria and confirmed testing) • Higher A1C levels generally indicate higher average blood sugar levels • Long-term high blood sugar increases risk of complications affecting the eyes, kidneys, nerves, heart, and blood vessels • Some medical conditions affecting red blood cells or hemoglobin may alter A1C results
A1C is a blood test for type 2 diabetes and prediabetes. It measures your average blood glucose, or blood sugar, level over the past 3 months. Doctors may use the A1C alone or in combination with other diabetes tests to make a diagnosis. They also use the A1C to see how well you are managing your diabetes. This test is different from the blood sugar checks that people with diabetes do every day.
Your A1C test result is given in percentages. The higher the percentage, the higher your blood sugar levels have been:
- A normal A1C level is below 5.7%
- Prediabetes is between 5.7 to 6.4%. Having prediabetes is a risk factor for getting type 2 diabetes. People with prediabetes may need retests every year.
- Type 2 diabetes is above 6.5%
- If you have diabetes, you should have the A1C test at least twice a year. The A1C goal for many people with diabetes is below 7. It may be different for you. Ask what your goal should be. If your A1C result is too high, you may need to change your diabetes care plan.
NIH: National Institute of Diabetes and Digestive and Kidney Diseases
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