Perception of blood transfusion risk.

Perceptions of risk ultimately drive the responses of individuals and society to risk issues, and transfusion risk is no exception. Surveys of lay people over the past decade indicate that public concern about transfusion safety has remained prevalent, dominated by the ongoing fear of contracting HIV infection. Such perceptions persist despite the acknowledgment that blood transfusion is safer now than in years past. Judgements by the lay public that may, at first glance, seem irrational can often be understood when the heuristics, biases, and models of human judgements of risk are considered. Risk perception research suggests that how lay people perceive risk has less to do with the unidimensional view of risk as a probabilistic expression and more to do with a complex multidimensional construct in which affect, reason, worldviews, trust, and other factors are intertwined. This review summarizes some of the principles of risk perception as applicable to transfusion medicine.