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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.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.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.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.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 ...

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.

www.webmd.boots.com/cholesterol-management/guide/fasting-before-cholesterol-blood-tests

Sep 7, 2016 ... A blood test can be used to measure cholesterol levels and other fatty lipids, but why do doctors ask you to fast before having a blood test?

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 ...