Lastly, the study aims to examine the self-identification as blood donors among individuals who were unable to donate blood during their first blood donation attempt in order to derive an appropriate term [...] Those presenting to donate for the first time are more likely to be deferred than repeat donors, and deferrals have a larger impact on the return behaviour of those deferred at their first attempt than [...] first blood donation attempt. Therefore, it is crucial to explore the perceptions and experiences of individuals who are deferred when first attending to donate, providing a better understanding of this phenomenon
https://psychologie.uni-greifswald.de/blood-donation/