Abstract
Within medical ethics it is widely agreed both that it would be morally wrong to give a competent patient medical treatment without his consent, and that for his agreement to treatment to constitute valid consent it needs to meet certain criteria. In illustrating why these requirements are needed it is common to use treatments that involve a healthcare professional doing something to the patient's body—for example, performing surgery, giving an injection, or taking a blood sample or swab (see, for example, Manson 2007, 299;...