can i have coffee before a fasting blood test

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Is it ok to drink black coffee when your fasting for blood test?

Fasting for Labs

Blood
Yes. There are no sugar or fat calories in black coffee.
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Will drinking decaf black coffee before fasting blood test alter the results?

Yes

Blood
could depending on the test, if is blood sugar or chol then coffee could make an impact
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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.

No.

Potassium
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.
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Dr. Anne M. Larson answered:

Can drink coffee before blood test cause elevated alt?

No

Blood
In fact, coffee has been shown to lower AST and ALT.
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Dr. Milton Mintz answered:

I have to fast for 12 hours before blood test. Can I drink black coffee during those 12 hours?

Yes

Blood
One cup won't change your results
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How can coffee with cream and aspertane ( equal brand sweetener ) affect a blood test for diabetes?

Aspartame

Blood
It doesn't. Aspartame is an artificial sweetener which has no calories and does not raise the blood sugar. It also does not get broken down by the body and gets stored in the liver. Safer and natural sweetener alternatives are Agave and Stevia. Stevia has no calories and will not raise blood sugar. Agave has a low glycemic index and will raise blood sugar slowly. Both taste great--try them!
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Dr. Gurmukh Singh answered:

Is it possible for me to drink coffee before a thyroid blood test?

You may

Blood
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.
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Dr. Ahmad M Hadied answered:

How does coffee with cream and stevia affect a blood test for diabetes?

Hard question

Diabetes_mellitus
The U.S. Food and Drug Administration recognizes stevia as safe, clearing the way for foodmakers to use it in a variety of products. Interest in stevia is high because it comes from a plant and has virtually no calories and no carbs, and therefore won't raise blood sugar . Dairy products have carbohydrates and can affect blood sugar.If you have type 2 diabetes and you're could increase your .
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Dr. Gurmukh Singh answered:

I drank a cup of coffee with cream and artificial sweetener before a blood test for diabetes, will this show up as diabetes?

Fasting

Sugar_substitute
It is imperative to be fasting for at least 9 hours, preferably 12 hours before the test.
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Dr. Liza H. Kunz answered:

Decaf coffee VS coffee.i take 4 cup of coffee per day. (2 cup of decaf and 2 cup coffee per day)am doing blood test on 25th for pregnancy .is it 2much?

Maybe

Blood
Data suggests that it may be best to limit yourself to no more than 1 regular cup of coffee a day while pregnant.
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