Background: Donor reaction has the most negative impact on the blood donor return rate. Amelioration of some adverse events has the potential to improve return rate. This study was initiated with the aim to determine the frequency of various adverse reactions. https://www.lightemupsequences.com/flash-pick-Tiki-Luau-Shaped-Thank-You-Cards-Tropical-Hawaiian-Summer-Party-Thank-You-Note-Cards-with-Envelopes-Set-of-12-top-super