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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.
Can you have a cup of tea before a fasting blood test? You shouldn't: While the tea by itself is considered a liquid only, you may mix it with sweetner or cream. Further, there can be stimulating effects, which may have a change in your glucose or Insulin release. Just better to have water only.