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Answer Wiki. Summary: peak running performance after donating blood may be impacted for up to 1-2 weeks after donating 1 pint of blood, but is most noticeably impacted within the first 1-2 days after donating when attempting to perform at peak levels during endurance activities.
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.