A Study of Criteria for Blood Donor Deferral

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Abstract
Donor deferral rates in regional blood centers vary from 5-24%, reducing by more than 1,250,000 the number of units of volunteer blood available for transfusion in the nation each year. Those criteria for donor deferral which are intended to exclude donors likely to suffer a donor reaction are based partially on untested hypotheses and tradition. In a 6 mo. prospective study, more liberal criteria were adopted for donor acceptance. During this period, donor reaction rates did not increase and the deferral rate fell from 10 to 7%. Less restrictive criteria can probably be used for donor selection without compromising donor safety. If all blood centers reduced their deferral rates to 7%, the nation''s blood supply would be increased by more than 500,000 units annually.