Why can’t you eat past a certain time at night if you have to take a blood test the next morning?

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I am supposed to take a blood test in the morning and my doctor told me that I have to do it on an empty stomach, and can’t eat anything after 9pm. I understand how alcohol, for one, could impact blood test results but why food? Asking cause I’m hungry 🙁

In: Biology

6 Answers

Anonymous 0 Comments

Certain blood tests require you to be fasting. Blood sugar, cholesterol (I think) and others. So you have to be hungry when you take the test. Eating causes sugar and other compounds to go into your blood, and will cause the test results to be wrong.

For example, if you were to eat before the blood work, the blood work could come back that you have diabetes, when you don’t.

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