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Doctor insights on: Can I Have Coffee Before A Fasting Blood Test

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Dr. Terri Washington
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Three cups of black coffee before my fasting blood test. Potassium came in at 5.7. Could this be the cause. I'm healthy otherwise.

Three cups of black coffee before my fasting blood test. Potassium came in at 5.7. Could this be the cause. I'm healthy otherwise.

No. : Have the test repeated. Blood cells can break down and release potassium. If the specimen was drawn in a way that traumatized the red blood cells, or if it sat around a long time before being tested, it will have an artificially high potassium. ...Read more

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Dr. Robert Killian
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Dr. Milton Mintz
Board Certified, Geriatrics
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Board Certified, Hepatology
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Dr. Gurmukh Singh
Board Certified, Pathology
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Is it possible for me to drink coffee before a thyroid blood test?

You may: If thyroid blood test is the only test you are having, coffee is not likely to materially affect the results. Generally it is better to be fasting for lab tests. ...Read more

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Dr. Gurmukh Singh
Board Certified, Pathology
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Dr. Gurmukh Singh
Board Certified, Pathology
43 years in practice
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I am 18 i woke up and drank coffee with 2 teaspoons of sugar and i took a blood test and the result was 108 is it normal ?

I am 18 i woke up and drank coffee with 2 teaspoons of sugar and i took a blood test and the result was 108 is it normal ?

Depends: Blood glucose is best monitored in fasting condition. You should have fasted at least 8 hours not taken anything other than water. This result is not interpretable due to your intake of coffee and sugar before the blood draw. ...Read more

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Dr. Gurmukh Singh
Board Certified, Pathology
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Can coffee give cause cancer do I need to have a blood test.

Can coffee give cause cancer do I need to have a blood test.

No and No: Coffee does not give you cancer and you do not need a blood test. Incidentally there is no good blood test for cancer. ...Read more

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Dr. Keegan Duchicela
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