To avoid people being denied the right to medical self-determination because they are unable to express their will, anyone over 20 years of age and of full capacity may make an "advance declaration" of their wishes (also known as a "living will"), and may appoint a medical representative who is empowered to sign a consent form on their behalf if they are unable to express themselves.
如果要避免因無法表達，而不能享有醫療自主權，還可以預立意願書。只要年滿二十歲具完全行為能力者，都可以預立意願書，並可預立醫療委任代理人，在自己無法表達意願時，代為簽署意願書。