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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.
In some instances, your doctor will ask you to avoid only certain foods, beverages or medications before a test. Your doctor will inform you what time your blood test is scheduled, whether to fast and, if so, how long you must fast beforehand, generally between eight and 12 hours.Prepare for a water-only fast by eating a nutritious meal prior to the fasting period.n some instances, your doctor will ask you to avoid only certain foods, beverages or medications before a test. Your doctor will inform you what time your blood test is scheduled, whether to fast and, if so, how long you must fast beforehand, generally between eight and 12 hours.