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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
512 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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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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M58, does recent infection affect Hemoglobin A1c test. ?

M58, does recent infection affect Hemoglobin A1c test. ?

No: There Are some conditions that can affect your HgbA1c level but infection is not one of them. ...Read more

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Can eating before a hemoglobin A1c blood test make the levels higher than they really are?

Can eating before a hemoglobin A1c blood test make the levels higher than they really are?

No: Hemoglobin A1c is a test used to measure the sugar content in your blood that has occurred over the last few months. By eating before a blood sugar test (usually done by finger prick) you can elevate the sugar levels in your blood, but this won't immediately change your hba1c. Hba1c comes from a build-up of "glycated hemoglobin" in the red blood cells over their life cycles, about 120 days. ...Read more

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Blood test showed low hemoglobin A1c (4.4%) Everything else was normal. What could cause this?

Nothing bad: actually the low level does not mean much higher level could indicate that you average blood suger could be higher than normal and it depend how high it is lower level could indicate normal or slightly lower blood sugar and most of the time it is normal the test is design to check average blood sugar for the last 1-2 weeks and the sensitivity and the accuracy of the test is higher in high BS ...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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Hemoglobin a1c 5.7. No diabetes anywhere in my family and I weigh 108 lbs and I'm 29. I don't eat much sugar at all. Is this still a concern?

Exercise: Your A1c is normal, albeit at the high end of normal. You can improve your insulin sensitivity by exercise, even though you are not overweight. Aerobic exercise, any exercise, will help. Wish you good health! ...Read more

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My tsh test results are 1.42 my eag is 111 and my hemoglobin a1c is 5.5 is all this normal i cant ask my doctor till i go back in several weeks?

My tsh test results are 1.42 my eag is 111 and my hemoglobin a1c is 5.5 is all this normal i cant ask  my doctor till i go back in several weeks?

FATIGUE EVAL: Yes , TSH and HBA1C are normal. You need full EXAM AND labs. CBC/CMP/B12/FOLATE /TFTS/VITD/CRP//SED RATE//IRON STUDIES/LYME TITERS. Start a. Gluten free diet Wholeapproach.com gutbliss.com. And high potency vitamins. Rejuvenation-science.com Then review results if no firm diagnosis is made, a sleep study may be necessary many subtle sleep disorders cause Fatigue ...Read more

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How do I read my blood test thyroid panel , hemoglobin a1c, beta chorionic gonadotrop (hcg), ?

How do I read my blood test thyroid panel , hemoglobin a1c, beta chorionic gonadotrop (hcg), ?

Discuss with your MD: You need to discuss with your doctor who ordered those blood work-in regard to the blood work result. ...Read more