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Hydrate yourself. To prepare your body for the loss of blood, you need to drink plenty of water or fruit juice the night and morning before you donate. The leading cause of faintness and dizziness when you give blood is a drop in blood pressure or blood sugar.
The short answer to your question is simply that you do not need to wait until the blood test comes back before going ahead and donating blood. When you donate a unit of blood, the American Red Cross automatically performs a whole bunch of tests on the blood to make sure that the unit is safe and acceptable for use.