Cohort of Repeat Donor Experiences (CORE) Study

The study employs a two-phase prospective design: (1) data collected before and 48-72 hours after an initial plasma Data will be collected through electronic surveys, real-time illness reports, biomarker analyses, and extracts of Blood Establishment Computer Software (BECS) records including donor screening and operational collection processing variables, if available. Study staff (Study Coordinators employed by the plasma collection companies and Westat central study staff) will engage with participants directly and Westat systems will be used for data collection. The pilot study is planned to occur prior to the main study, planned for early 2026, which will validate the feasibility of study methods and generate preliminary data toward the study aims. The pilot study will involve recruitment and enrollment of 50-90 participants at 2 donor centers for a three-month follow-up period. Pilot study participants will follow the main protocol study procedures, with the addition of brief feedback questions about their participant experience and the omission of End of Year Surveys, due to the shorter follow-up time.