OverviewWhy is Hemoglobin A1c important.What’s a glycated hemoglobin test?A glycated hemoglobin test measures the amount of glucose (sugar) in your blood. The test is often called A1c, or sometimes HbA1c. It’s a simple blood test used to: Show
How does the A1c test work?A1c testing relies on hemoglobin. Hemoglobin is the part of the red blood cell that carries oxygen throughout the body. When you have glucose in your blood, it glycates (sticks) to hemoglobin. The more glucose in your blood, the more it sticks. And it can stay there for around three months, or about how long the average red blood cell lives. The A1c test measures the average amount of glucose that’s been attached to hemoglobin over time. So the A1c test provides more information about blood sugar over a longer period of time than home monitoring does. When is an A1c test needed?If you have diabetes, you should have an A1c test two to four times a year to see how you’re managing it. Your healthcare team will recommend exactly how often you should get tested. If you haven’t gotten diagnosed with diabetes, a healthcare provider may order an A1c test if you have symptoms of the condition. These symptoms include:
You may also get an A1c test if you’re at risk for diabetes. Risk factors include:
Test DetailsHow do I prepare for an A1c test?You don’t need to fast (restrict food or drink) or do anything else special before the test. What happens during an A1c test?Some healthcare provider offices have an A1c machine that requires only a small drop of blood from the fingertip (similar to a home glucose check) and provides a result in just a few minutes. Other healthcare providers may order the A1c as a lab test to be drawn in the medical office, a hospital or a lab. The test usually takes less than five minutes, and it often takes a day or two to get the result. The person drawing your blood will:
Are there any risks with an A1c test?Blood tests are very common and don’t carry any significant risks. You may have slight pain when the needle gets inserted, and a small bruise may develop there. Results and Follow-UpWhen will I know the results of the A1c test?Ask your healthcare provider when you can expect to get the results. They may be ready the same day or up to a week later. What do the A1c test results mean?An A1c test result gets reported as a percentage. The number represents the portion of hemoglobin proteins that are glycated, or holding glucose. The higher the percentage, the higher your blood sugar levels have been over the last few months.
What is A1c compared to eAg?If you have diabetes and track glucose with a home monitor, your healthcare provider might report A1C results as eAG. This converts the information to a different way of measuring. You can then compare it to the results of home glucose monitoring. Instead of a percentage, eAG gets reported in milligrams per deciliter (mg/dl) or millimoles per liter (mmol/l). For example, an A1c level of 7% equals an eAG of 154 mg/dl and 8.6 mmol/l. The American Diabetes Association offers a calculator and chart to help you convert your numbers. Additional DetailsCan my race or ethnicity affect my A1c results?There are different kinds of hemoglobin. The most common is hemoglobin A. But some races and ethnicities have different types of hemoglobin, called hemoglobin variants. A hemoglobin variant doesn’t increase the risk for diabetes, but it can affect A1c results. Labs have different ways to do A1c tests on blood with a hemoglobin variant. The most common variants are the:
Talk to your healthcare provider about how often you should get an A1c test. Also discuss whether you might have a hemoglobin variant that could affect the results. How long does HbA1c reflect?HbA1c reflects average plasma glucose over the previous eight to 12 weeks (15). It can be performed at any time of the day and does not require any special preparation such as fasting.
Which test reflects glucose control over a period of time?The A1C test is also the primary test used for diabetes management. An A1C test is a blood test that reflects your average blood glucose levels over the past 3 months. The A1C test is sometimes called the hemoglobin A1C, HbA1c, glycated hemoglobin, or glycohemoglobin test.
What time period is the HbA1c monitoring?The A1C test—also known as the hemoglobin A1C or HbA1c test—is a simple blood test that measures your average blood sugar levels over the past 3 months.
How long does glycated hemoglobin last?When you have glucose in your blood, it glycates (sticks) to hemoglobin. The more glucose in your blood, the more it sticks. And it can stay there for around three months, or about how long the average red blood cell lives.
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