Justifying risk-related standards of capacity via autonomy alone.

The debate over risk-related standards of decisional capacity remains one of the most important and unresolved challenges to our understanding of the demands of informed consent. On one hand, risk-related standards benefit from significant intuitive support. On the other hand, risk-related standards appear to be committed to asymmetrical capacity-a conceptual incoherence. This latter objection can be avoided by holding that risk-related standards are the result of evidential considerations introduced by (i) the reasonable person standard and (ii) the standing assumption that patients have capacity. This evidential approach to justifying risk-related standards of capacity avoids the most significant challenges faced by extant views while grounding risk-related standards in two fairly uncontroversial views in biomedical ethics.