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Doctor insights on: Do I Need To Fast Before A Blood Test

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Do i need to fast before blood tests?

Do i need to fast before blood tests?

Depends: Depending on what kind of blood tests are being done, you may need to fast. If you are having a metabolic panel, liver panel or cholesterol panel you will need to fast. Probably would be best if you check with your ordering physician to make sure that you understand what you need to do. This will make you avoid potentially abnormal results or the need for a repeat test later. ...Read more

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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

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Do I have to get some blood tests before doing a thoracentesis?

Do I have to get some blood tests before doing a thoracentesis?

Yes: A doctor will usually want a few simple blood tests to make sure you do not have some potential for bleeding prior to a thoracentesis. It depends a lot on what medications you are currently taking, especailly blood thinning medications and your general level of health at the time of the thoracentesis. A protime test and a blood count are typical tests to do prior. ...Read more

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Do you need to fast before getting a thyroid n cvc test?

Do you need to fast before getting a thyroid n cvc test?

No: You do not need to fast for a thyroid blood test. I don't know what you mean by "cvc" test. Do you mean a "cbc", which is a complete blood count. You don't need to fast for that either. ...Read more

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What to do if I have an appointment for a blood test at noon tomorrow and What to do if I have to fast for 12 hours and I was wondering?

What to do if I have an appointment for a blood test at noon tomorrow and What to do if I have to fast for 12 hours and I was wondering?

Depends: There are many different types of blood test and only some require that you fast. You should of received information regarding this when the test was scheduled. If you have any questions, feel free to call the clinic or laboratory directly and ask them if you need to do anything prior to the test. It's better that you be informed and prepared before going. ...Read more

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Do i have to fast before i take a vitamin level blood test?

Do i have to fast before i take a vitamin level blood test?

No! Fasting of?Value: Fasting for most issues not only of low value but often misleading. Ex.: people commonly told to fast before blood glucose test; yet Diabetes Mellitus=elevated blood glucose & glucose most commonly elevated after eating. Thus fasting glucose routinely misses Diabetes Mellitus. Fasting is promoted for only a few issues because how databases were done or because the values are calculated/estimated. ...Read more

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What to do if I go for another blood test tomorrow, how much blood will they take?

What to do if I go for another blood test tomorrow, how much blood will they take?

Not much: If for blood sugar, you need to fast, no food after dinner,or before midnight. They will be gentle get some info and if panels will take a few vials from your arm vein or even just finger stick if just a few test. The manner depends on your docs prescription and the venue of the test: if Quest usually a couple or several small tubes are enough,not to worry less much less than donating your blood. ...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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Do I have to get some blood tests before doing a thoracotomy?

Do I have to get some blood tests before doing a thoracotomy?

Yes: A thoracotomy is a specialized procedure to get into your chest. Coagulation tests should be acceptable to minimize the risk of bleeding. Usually your lung function should be available if high risk morbidities (risks) & a baseline oxygenation (oxymetry). Unless a risk for cardiac problem that is enough. ...Read more

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What to do if i forgot to fast before bloodwork?

What to do if i forgot to fast before bloodwork?

Tell the lab: Let the lab or office now so they can account for that when interpreting results or re-schedule that particular test for when you are fasting. Not all blood tests require you to be fasting but some will give false results if you are not fasting at least 6 hours. ...Read more

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I have a blood test tmrw afternoon to check my vitamin d. When do you have to fast for a blood test? I don't have to right? I forgot to ask. Thanks.

I have a blood test tmrw afternoon to check my vitamin d. When do you have to fast for a blood test? I don't have to right? I forgot to ask. Thanks.

Not necessary but...: No, you do not have to fast for this test, but it is wise to not eat much within a couple of hours of any blood test as shortly after a meal your blood will be loaded with triglycerides which reduces the amount of serum available for testing. So i advise either eating a light lunch or waiting about 3 hours after eating- but that is not absolutely essential. ...Read more

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Hi I was wondering if when you go to the doctor do they test for pregnancy when you give blood or urine.

Hi I was wondering if when you go to the doctor do they test for pregnancy when you give blood or urine.

Pregnancy test: We only check for pregnancy if we're suspicious but we'll always tell you first. Home pregnancy tests via urine as just as accurate as those urine tests in doctors' offices. Blood tests are even more accurate. ...Read more