document that lets you outline your end-of-life care preferences. You can state whether you want to receive certain medical treatments, procedures, medication, blood transfusions, and more. If you're ever incapacitated (for example, in a coma) and can't communicate your wishes, your doctors will consult the instructions in your living will and try to follow them, if they're reasonable. Without a living will, it's up to your doctors, family members, and state law to choose what healthcare you receive.