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

Aug 14, 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.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.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.health.harvard.edu/staying-healthy/ask-the-doctor-what-blood-tests-require-fasting

Nov 13, 2014 ... Very few blood tests require a period of fasting before the test. They include tests for blood glucose and triglycerides. It is permitted 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.zocdoc.com/answers/9100/why-do-i-have-to-fast-before-my-blood-test

Some routine blood tests require that the person not have any food for about 8 hours prior to getting the test. The two most common tests that requir.