Informed consent must be...

Informed consent must be voluntary and based on complete information to ensure that the individual making the decision fully understands the implications of that decision. This means that the person giving consent must receive all necessary information about the proposed course of action, including its potential risks, benefits, and alternatives. The key aspect of informed consent is that individuals should not feel coerced or pressured when making their choices. They should have the freedom to make an informed decision based on their circumstances and preferences.

Having it obtained only from a legal guardian restricts the scope of informed consent and may not apply in all situations, particularly with competent adults. Requiring a notary public for signing adds an unnecessary level of formality that is not needed for informed consent. Lastly, gathering consent from previous health records does not relate to the individual's current understanding or voluntary agreement, deviating from the essential principles of informed consent.