In this paper, priority setting in health care is defined as distributional
decisions at the individual level involving clear and direct limitation of
access to beneficial health care according to some categorical criterion o
ther than the market. The justification of a particular rule of priority se
tting depends on conceptual issues as well as on the choice of value premis
es. Especially important is the type of scarcity involved (whether the imba
lance between supply and need can be overcome or not) and the concept of ju
stice used or presupposed (for instance, whether the conception of justice
emphasizes efficiency or fairness or both). The proposal put forward is tha
t the task of medical ethics is to provide conceptual clarification and val
ue premises relevant to justify rules of priority setting. The actual choic
e of such rules belongs primarily to the domain of politics.