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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.
A row of tea cups hanging on hooks. Photo Credit Image Source White/Image Source/Getty Images. People who normally drink tea in the morning may have to forego that pleasure when preparing for a diagnostic blood test. Many common blood tests require fasting to produce an accurate sample for evaluation. Your ability to follow instructions will determine how successful you will be.