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Drink Water. Many people believe they should avoid water before a blood draw, but this couldnât be further from the truth. Drinking water will not only make you feel better if youâre fasting, it will also make for a smoother blood draw.
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.