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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.

What Is Fasting and Do I Need to Fast? : Fasting Before Your Lab Test

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 ...

The Facts on Fasting for Blood Tests - WebMD

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.

Can I eat and drink before having a blood test? - Health questions ...

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 ...

New guidelines simplify cholesterol tests: no fasting needed

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 ...

Can I Eat Before Blood Tests? | LIVESTRONG.COM

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.

Fasting Blood Test - WellnessFX

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 ...

Fasting before cholesterol blood tests - Boots WebMD

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?

Getting Your Blood Drawn: What You Need to Know | One Medical

www.onemedical.com/blog/live-well/blood-draw-faq/

Jan 17, 2014 ... Fasting for a blood test entails avoiding all food and beverages (except ... Drink extra water beginning the day before your blood draw to ensure ...

How to Prepare for Your Blood Test | One Medical

www.onemedical.com/blog/live-well/blood-work-basics/

Sep 25, 2011 ... Blood Work Basics: What to Know Before Your Draw ... Many tests do not require fasting, but lipid panels (also known as cholesterol tests), ...