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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.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 ... How long should you fast before a blood test?

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

Fasting before a blood draw means you don't eat or drink anything except water. Don't wait ... How long do I have to fast for a blood test? It depends on ... Other lab tests may require fasting, which is why you should ask your doctor. If you think ...

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

You can eat and drink as normal before some blood tests. ... tests and what you may need to do to prepare for them, including how long you may need to fast. ... You should also avoid taking iron pills or tablets for 24 hours before your test.

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 ...

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.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), ...

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 ...