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Your provider should let you know whether you need to fast prior to having your blood drawn. If youâre not sure, confirm any requirements with your provider beforehand. Fast Smartly. Fasting for a blood test entails avoiding all food and beverages (except for water) for 8 to 12 hours prior to the test. Drink plenty of water and take your medications as usual.
Here are some guidelines for fasting for a blood tests: 1  It is important that you do not eat or drink anything but water. 2  You should not chew gum, smoke, or exercise before your test because all these activities can stimulate your digestive system and affect test results. 3  Avoid alcohol for at least 24 hours before your test.