A 24-hour blood donation marathon has been initiated by the Amadora-Sintra Local Health Unit (ULS) in Portugal, coinciding with World Blood Donor Day. The event will take place over the next two days, from 8:00 AM to 8:00 PM, at the Blood and Transfusion Medicine Service of Fernando Fonseca Hospital. The ULS issued a statement urging citizens to donate blood to help replenish supplies. The drive aims to increase blood reserves and support ongoing medical needs. Organizers hope the extended hours will provide greater accessibility for potential donors. This initiative underscores the critical importance of regular blood donations for maintaining healthcare capacity. The event serves as a key component of recognizing and appreciating voluntary blood donors.