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Doctor insights on: Hemoglobin A1c Can I Eat Before Test

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Do you fast for a hemoglobin A1c test?

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

Dr. Ira Katz
493 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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What can cause a high hemoglobin A1c test?

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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Do you have to fast for hemoglobin A1c test?

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's a normal result for the hemoglobin A1c test?

4 to 6: The normal range varies from lab to lab but is generally between about 4 and 6 percent. ...Read more

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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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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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Hemoglobin A1c fasting test result of 5.8 ? Good, fair, ?

Good: Guidelines are frequently revised in the diagnosis of prediabetes. The current guidelines consider Hgb a1c values of 5.7 or less to be normal. For practical purposes, a value of 5.8 is good. If there is family history of diabetes, it should be retested every six months ...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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