Informed Consent at Each Level of Development

A recent visit to a local hospital has me pondering:

What level(s) of development (along lines: cognition + self-relating group: consciousness, values, identity/ego) does the medical system assume? What level(s) do they respect? What would an integral approach look like?

What constitutes informed consent at each level of development?

How can this understanding inform our decisions individually (sexual, relational, etc.) and in our institutions (medical, legal, educational, financial, etc.)?