For the best and safest examination, the stomach must be completely empty. You should have nothing to eat or drink, including water, for approximately 6 hours before the examination. Your doctor will be more specific about the time to begin fasting, depending on the time of day that your test is scheduled.
It is best to inform your doctor of your current medications including over-the-counter pain relievers, vitamins, and herbal supplements. It is also important to inform your physician of any medication or latex allergies. Also, you should notify your physician if you are taking any blood thinners such as Aspirin, Coumadin, Plavix, Aggrenox, Ticlid, or Persantine.