What defines capacity to give informed consent?

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Capacity to give informed consent rests on the person’s ability to make a voluntary, well-informed decision about a specific treatment at that moment. It involves four skills: understanding the information about the treatment (what it entails, risks, benefits, and alternatives); appreciating how that information applies to one’s own situation and the likely consequences; reasoning about options by weighing benefits, harms, and uncertainties; and communicating a clear, consistent choice. These elements together show true decision-making capability for that moment.

This is why the other factors don’t define capacity. Age over 18 is not a guarantee of capacity—some adults may lack it for particular decisions, and in some cases minors can consent or assent. Literacy alone doesn’t ensure understanding of medical information. Having a guardian indicates someone is authorized to make decisions on the person’s behalf when capacity is lacking, not that the person who has capacity loses it; capacity is decision-specific and can fluctuate.