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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.
Preparing for Your Test. 1  For cholesterol and glucose tests, you must fast for at least 8 hours prior to having your blood drawn, unless your doctor tells you otherwise. 2  Drink plenty of water before your blood test. 3  Unless fasting is required for your testing, eat breakfast to help keep your blood sugar up.