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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.
Instructions: If you are asked to fast for your test: Â· Do not eat or drink anything (except water) for at least 8 hours before you go to the laboratory to have your blood taken. If your physician has ordered lipid tests, you must fast for at least 12 hours.You may drink water, but no juice, tea or coffee.Â· Do not smoke, chew gum, or exercise.ou may be required to fast before having a blood test. This is because certain test values change following the digestion of food. The measurement of blood sugar (glucose) and some blood lipids (fats and cholesterol) are common examples.