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

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Dr. Hormoz Ehya
Board Certified, Pathology
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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. Hormoz Ehya
Board Certified, Pathology
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Managing Low Blood Sugar (Checklist)

Avoid skipping meals
Once
Eat protein-rich snacks every 2 hours
Daily
Keep fruit with you at all times if you feel hypoglycemic
Once
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6
Managing Low Blood Sugar (Checklist)

Eat complex carbohydrates with protein
Once
Eat before you feel tired or nauseous
Once
Have glucose available if blood sugar is too low
Once
Board Certified, Pathology
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Managing Low Blood Sugar (Checklist)

Eat breakfast within 30 minutes of waking up
in the morning
Eat small high-protein meals / snacks of 125 cal
every 3 hours
Eat lunch on a regular schedule
daily
Eat an extra snack before exercise (100 cal)
once
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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. Hormoz Ehya
Board Certified, Pathology
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