I can't believe a doctor or hospital would agree to such a commitment. If the doctor wants to do an extra test or procedure to make sure the treatment is workin

I can't believe a doctor or hospital would agree to such a commitment. If the doctor wants to do an extra test or procedure to make sure the treatment is working as expected, then he's in a bad spot -- he either does it for free, or he faces malpractice liability if there is a bad outcome, regardless of any contract you may have signed with him.