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Doctor insights on: Do You Have To Fast The Day Before A Hb A1c Test

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Do you have to fast the day before a hba1c test?

Do you have to fast the day before a hba1c test?

No: The hemoglobin A1c is a measure of the amount of hemoglobin that is bound to glucose (blood sugar) in red blood cells. Red blood cells live about 120 days, so the A1c gives an idea of diabetic control over 3 months. Eating on the day of the test will make no difference. Be sure, though, that no other tests, such as fasting lipid panel or fasting chemistries, have been ordered along w a1c. ...Read more

Dr. Ira Katz
518 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 I have to fast for a hba1c blood test?

Do I have to fast for a hba1c blood test?

Not really: The aic test generally tells us what has been going on with your sugar over the past 3 months approximately. One does not really have to fast for it, but it is best done fasting in my opinion, because your doctor will probably want to see a fasting blood sugar at the same time to help manage your diabetes. Often a lipid panel is done at the same time, which requires one to be fasting. ...Read more

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finished a 9 day taper of prednisone and now I get a call saying doctor wants me to come in for Hba1c blood test with no explanation why?

finished a 9 day taper of prednisone and now I get a call saying doctor wants me to come in for Hba1c blood test with no explanation why?

Sugar: You likely have an elevated blood sugar on some previous blood testing done and your doctor wants to check to make sure you do not have diabetes ...Read more

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What is a hba1c test?

What is a hba1c test?

A measure: Of how much glucose attached to hemoglobin molecule.

It reflects your avg. Blood sugar over 3 m.

Normal up to 5.6
pre-diabetes 5.7-6.4
diabetes 6.5 and higher. ...Read more

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What is a normal hba1c test?

What is a normal hba1c test?

Under 6: Most laboratories will list the normal range of hba1c as 4-5.9.
If you have diabetes your doctor will probably try to get your hba1c below 6.5 - but if it can go lower that is good. ...Read more

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After how much time hba1c test should repeat? My last result was 5.8 is this normal

Every 3 months.: Half life of Hgb is 120 days.
You may use fructosamine levels very 2-3 weeks. Specially if BS is high and toy want to know if the initial treatment is satisfactory ...Read more

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What is a normalh hba1c test in a person that is not diabetic?

What is a normalh hba1c test in a person that is not diabetic?

HbA1c: It depends on lab normals. Mostly less than 6 percent. Now many define less than 5.7 percent as completely normal. ...Read more

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What does an hba1c test result of borderline low range (4.5) mean?

Good for you: The ranges are set to include most but not all healthy folks. I would not be at all concerned -- in fact, as a lab physician / pathologist, i'd urge you simply to ignore any lab that's not clearly out of kilter unless there's a specific reason for concern. ...Read more

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What does hba1c on a blood test mean?

What does hba1c on a blood test mean?

Average glucose: Hb A1c reflects the average blood glucose level over the previous 3-4 months. It is usually used to monitor glucose control in diabetes. It is also beginning to be used for diagnosis of diabetes. ...Read more

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HbA1C 5.4 (<5.5 normal). FBS 5.3 (<6.0 normal) with last meal 14 hours before test. Family hx of diabetes. Is FBS too high? At risk range? Thnx.

HbA1C 5.4 (<5.5 normal). FBS 5.3 (<6.0 normal) with last meal 14 hours before test. Family hx of diabetes. Is FBS too high? At risk range? Thnx.

Diabetes: Relax! There is no evidence, based on your numbers, that suggests you have diabetes.
That said, with a family history of diabetes it would be wise to get advice from the family about the best foods and drinks for someone concerned about diabetes. ...Read more

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Is the hba1c the test for diabetics?

Is the hba1c the test for diabetics?

Yes: It is one of the test, it is used for diagnosis an also for follow up on how a person is doing with their medicine. ...Read more

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Does smoking marijuana show up on an hba1c test?

Does smoking marijuana show up on an hba1c test?

No, tests glucose: The hemoglobin A1c test is specifically looking for the percentage of hemoglobin with glucose attached to it. If you are smoking marijuana it will have no effect on the hga1c and only a test to specifically detect cannabis will show that chemical. ...Read more

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When hba1c blood test should be taken in fasting or after eating?

When hba1c blood test should be taken in fasting or after eating?

Does not matter: The a1c is a 2 month look-back at blood sugars. It does not matter whether or not you have eaten. ...Read more

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For pre diabetic patients, every how long you do the test HbA1c?

6 months: There is no hard recommendation. I usually do it every 6 months. If the patient is making a lifestyle intervention I do it every 3 months. ...Read more

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My recent hba1c test was below diabetic levels. Can I stop checking blood sugars?

My recent hba1c test was below diabetic levels. Can I stop checking blood sugars?

Check with your doc: Most likely yes you can stop checking but your doctor should be the one telling you this. If you stop checking, make sure you still see your doctor regularly to get labs check to know if the diabetes is still well controlled or out of control again. ...Read more

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I make HBA1C test b4 4month and I get 7.4 after that I stop smokig and I made diet and sport and I test but the result is 8 is that mean its Diabetes?

I make HBA1C test b4 4month and I get 7.4 after that I stop smokig and I made diet and sport and I test but the result is 8 is that mean its Diabetes?

Definitely diabetes: Hi. It was definitely diabetes at the A1c of 7.4%; now control is worse at 8%. Stay off smoking...it will kill you. Eat healthily and exercise regularly FOR LIFE (not just the next couple of months). You need medication for diabetes. See your doctor. Determine if type 1 or type 2, and treat accordingly. Good luck! ...Read more

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Hi....My fasting blood sugar is 5.54mmol/l. I have also done hba1c test and the result is 5.0%. I need your kind suggestions?

Hi....My fasting blood sugar is 5.54mmol/l. I have also done hba1c test and the result is 5.0%. I need your kind suggestions?

Diabetes: If your hemoglobin a 1c is 5 then do not worry you are not diabetic however if you have a family history of diabetes you have to check your blood sugar and hemoglobin a1c more frequently. ...Read more

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Hba1c test is within range but fasting blood sugar is 7.2. Can u get a true answer when checked after 12 hrs of eating?

Hba1c test is within range but fasting blood sugar is 7.2. Can u get a true answer when checked after 12 hrs of eating?

Diabetes: Hi. Of the 4 means to diagnose diabetes, A1c and non-fasting (random) glucose are the least sensitive; glucose tolerance test and fasting glucose are the most sensitive. Your fasting serum glucose of 7.2 is frankly diagnostic of diabetes, and at the very least, impaired glucose tolerance. It should be repeated for confirmation. Fasting should only require 8 hours of not eating. Healthy lifestyle! ...Read more

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What to do if I had a fasting blood glucose test and have been told it was high, I now have to have a hba1c on tuesday?

What to do if I had a fasting blood glucose test and have been told it was high, I now have to have a hba1c on tuesday?

HbA1c: This is a blood test that tells the doctor how well your blood sugar has been controlled over the last 3 months. If you had a high fasting sugar and your A1c is very high then you will know that you have diabetes and it is not well-controlled. If you have a low / normal A1c then you probably just starting to develop diabetes and can treat it with diet and exercise first. ...Read more

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My sugar blood test =101 after 12 h fasting and the hba1c =5.3, I am so much worry about this, should I be? Labs says that normal range is 75-115?

My sugar blood test =101 after 12 h fasting and the hba1c =5.3, I am so much worry about this, should I be? Labs says that normal range is 75-115?

Not to worry...: These values are within the expected range, so I see no need to worry about them. If you are concerned about possibly having diabetes, due to family history, then I would suggest you see your primary care physician to discuss these concerns. ...Read more