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How long to fast, if at all, before a blood test depends on what your blood will be tested for. For example, cholesterol, glucose, and glycohemoglobin blood tests require that you fast for 12 hours.

www.questdiagnostics.com/home/patients/prepare-for-test/fasting.html

With certain blood tests, you may be instructed to fast for up to eight hours before your appointment. Fasting before a blood draw means you don't eat or drink ...

www.healthline.com/health/fasting-before-blood-test

Mar 22, 2017 ... Here's what you need to know about fasting before a blood test, including how long to fast for and if you can drink coffee.

www.webmd.com/cholesterol-management/fasting-blood-tests

Jul 6, 2016 ... Your doctor says you need to fast before some blood tests. WebMD explains what that means and why you have to do it.

www.statnews.com/2016/04/29/fasting-cholesterol-testing

Apr 29, 2016 ... What was the point of fasting before having a cholesterol test? Not eating for eight to 12 hours before having blood drawn for a cholesterol test ...

www.nhs.uk/chq/Pages/1018.aspx?CategoryID=69

In other cases, you will be instructed not to eat or drink (other than water) before your test. This is known as a fasting blood test. You may also be told not to drink ...

www.livestrong.com/article/440994-can-i-eat-before-blood-tests

Feb 12, 2017 ... Before having blood tests completed, be sure to check with your doctor so you know if you can eat or need to fast prior to the test.

www.wellnessfx.com/info/fasting-blood-test

If you've ever had your cholesterol or glucose levels tested before, you know that food and drink intake can affect the outcome of blood tests. That's why a fasting ...

well.blogs.nytimes.com/2016/05/24/ask-well-should-you-fast-before-a-cholesterol-test

May 24, 2016 ... But “it doesn't matter if you eat” before a cholesterol test if the main goal ... fasting may have little impact on cholesterol blood test results was a ...

www.leaf.tv/articles/how-long-to-fast-before-a-blood-test

Fasting before a blood test is important to obtain accurate readings. When you consume food, your body has to process the food's components as they travel ...