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.
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 ...
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.
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 ...
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 ...
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.
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 ...
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?
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 ...
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), ...