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Doctor insights on: How Long Do You Have To Fast For A Hemoglobin A1c Test

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How long do you have to fast for a hemoglobin A1c test?

How long do you have to fast for a hemoglobin A1c test?

Hgb A-1-c: Does not require fasting. It reflects blood sugar control over time. The fast is usually for the blood sugar or lipid profiles drawn at the same time. ...Read more

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Dr. Ira Katz
495 doctors shared insights

Hemoglobin A1c (Definition)

It helps determine the average blood sugar over a long period of time, about 2 or ...Read more


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Do you fast for a hemoglobin A1c test?

Short answer: The test measures indirectly measures glucose control over the preceding 6-8 weeks. It does not measure sugar directly; therefore i would believe it not to be necessary to fast prior to the test. However, the best way to answer this question is to call the lab where you go to have the blood drawn and ask them directly whether you need to fast for the test. ...Read more

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Do you have to fast for hemoglobin A1c test?

No: For hba1c alone, no fasting is required, but it is often done with other tests, like cholesterol or blood sugar, for which fasting is indicated. ...Read more

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What does a hemoglobin A1c test level of 7.79 indicate?

What does a hemoglobin A1c test level of  7.79 indicate?

Elevated blood sugar: The A1C determines your blood sugar level for past 3 months. On the lab I am familiar with above 6 is abnormal. ...Read more

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How accurate is a hemoglobin A1c test in indicating hypoglycemia?

Poor: Hba1c is fair at detecting chronically high bgs, but very poor at detecting low bgs. Fortunately, true low bgs are very rare and almost never sustained or recurrent. The sensation of "hypoglycemia", when related to sugar at all in people not treated with diabetes medications, is usually the normal response to low-ish sugars, which corrects them and keeps the body well. ...Read more

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Is a hemoglobin A1c test a conclusive test for diabetes?

Is a hemoglobin A1c test a conclusive test for diabetes?

If elevated, >6.5...: It equals diabetes but people can have nml (up to 5.6), or prediabetic range hga1c (5.7-6.4) and still have diabetes by blood sugar criteria; fasting 126 or >; 2 hour after eating =/>200. ...Read more

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Could eating more carbohydrates increase a hemoglobin A1c test in a non-diabetic?

Probably not...: Your body has an incredible ability to regulate blood sugar levels and when this ability is intact, excess carbs will be converted and stored as fat, thus should not raise your a1c. Once the ability is diseased, the excess carbs/sugar stay as sugar, thus higher blood sugar in diabetic, and will raise your a1c over time. Moderation is key. Live a well-balance life. Live long. Consult doc. Good luck. ...Read more

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What can cause a high hemoglobin A1c test?

Poor sugar control: Hemoglobin A1c measures average blood sugar over approximately the past 3 months. It is the measure of how much hemoglobin is attached to sugar molecules in the blood. Sugar in your blood binds to the hemoglobin of the red blood cell and stays there throughout the cell's lifetime (120 days). At high levels of blood sugar, more reacts w/ the hemoglobin, causing an elevated hemoglobin a1c. ...Read more

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