Ah-ha – well forgive me but I'm going to use this to practice one of my model answers for my forthcoming exams, as this question is indeed one which has come up in medical finals before.
Informed consent is not equivalent to treatment on demand.
As I'm sure you, Cindy, are well aware, it's a concept which has a precise meaning within the medical community. The problem is that this meaning is not what most lay people would understand it to mean.
It means that a patient has consented to a procedure having been given a proper level of understanding of the relative risks and benefits of the procedure, the precise process involved, and has been appraised of any commonly available alternative approaches.
It does NOT mean that a doctor is obliged to provide a particular treatment which, in their clinical judgement, will not benefit the patient, nor does it fully exonerate them if they do, and the treatment then proves harmful.
So within medical jurisprudence it is categorically not an alternative to conducting a proper clinical assessment (for example RLE), rather it is the final step in that process.
It does NOT mean that a patient is assuming all of the risk, it just means that the patient has been fully informed of all the possible options and then properly allowed to express their own preference, which has been taken fully into account.
As a patient it gives you the right to request or refuse a specific approach, but it does not mean that the clinician is the obliged or indeed cleared to follow that if they do not agree that the treatment has a reasonable chance of benefit.
As a medical student, one of the things we are marked on in every single OSCE station that we do is the quality of our "informed consent" of the patient for that station. Hence I might say something like:-
"Hello my name is Jenny ### and I'm a 4th Year medical student. The doctor has asked me to take a look at your ankle today, this will involve you taking off your shoes and socks, and I'm going to need to look feel and move the ankle, which may cause you some slight discomfort. Please do let me know if you feel any pain.
As I'm a student I will be fully supervised, and if there is any doubt over the findings my supervisor may wish to repeat the examination, so if you would prefer that my supervisor takes over at any point then please feel free to ask. It won't affect your care if you do. Are you happy for me to carry out the examination?"
That is an example of proper informed consent for examination.