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Doctor insights on: What Can You Have Before A Fasting Blood Test

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Can you fast too long before a fasting blood test?

Can you fast too long before a fasting blood test?

In a way, yes: If you fast for longer than a day or so, it will alter some blood chemistries. Fasting tests are usually set for an overnight fast, or a 12 hour fast. Prolonged fasting is starvation and it affects the body metabolism. ...Read more

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Can you have a cup of tea before a fasting blood test?

You shouldn't: While the tea by itself is considered a "liquid" only, you may mix it with sweetner or cream. Further, there can be stimulating effects, which may have a change in your glucose or Insulin release. Just better to have water only. ...Read more

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What do the results of a fasting blood test indicate?

Depends on test: Ask you doctor what they are specifically testing because there are different tests that are done fasting. Most common are fasting blood sugar and cholesterol. ...Read more

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Do i need to have a fasting blood test while taking metherexate?

No: The test done to look for Methotrexate toxicity do not have to be done in a fasting state. ...Read more

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Could a fasting blood test tell if I have hypothryoidism?

Could a fasting blood test tell if I have hypothryoidism?

Possible: If the lab order included the thyroid function test. Usually the routine blood work does not include thyroid function test, unless the ordering doctor is suspecting that you have signs or symptoms of hypothyroidism. Hope this helps. ...Read more

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What happens if you weren't fasting till 1am and go for the fasting insulin blood test?

What happens if you weren't fasting till 1am and go for the fasting insulin blood test?

Need Eight hours: The minimum fasting period is eight hours. If you get your blood drawn after 9:00 am, you should be okay. It is preferable to have a 12 hour fast. ...Read more

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Can what you eat the day before affect a fasting blood test?

To a modest degree: The most important thing to to make sure you fast, not change your normal diet because of the testing. ...Read more

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Is an LDL direct measurement blood test accurate if you are not fasting?

Is an LDL direct measurement blood test accurate if you are not fasting?

Yes: Direct measurement of LDL is accurate in non-fasting condition. Triglyceride levels are not reliable in non-fasting state.
For good health - Have a diet rich in fresh vegetables, fruits, whole grains, milk and milk products, nuts, beans, legumes, lentils and small amounts of lean meats. Avoid saturated fats. Exercise at least 150 minutes/week and increase the intensity of exercise gradually. Do not use tobacco, alcohol, weed or street drugs in any form.
Practice safe sex. ...Read more

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I had a MMA B-12 blood test done that was normal and wasn't fasting, is test most accurate when have been fasting?

Unclear info: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Having said that, it would have been useful to have the results. MMA is a urine test and B 12 a blood test and neither is affect by fasting. ...Read more

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If a person took a bilirubin blood test while fasting for 12 hours,and took the same test while not fasting, would the results be the same?

If a person took a bilirubin blood test while fasting for 12 hours,and took the same test while not fasting, would the results be the same?

Shuld be..: Fasting does not usually affect the bilirubin levels. Did the test differentiate between direct and indirect bilirubin levels? That can tell us sometimes where the elevation is coming from. You should follow up with the doctor who ordered your tests for further discussion about the results and where to go from here. ...Read more