An advance directive is a legal document that lets you spell out your wishes with regard to future health care. An advance directive typically consists of a living will and a durable power of attorney for health care. There’s no hard and fast rule for determining whether or not you need an advance health care directive. In the event that you don’t have a directive in place, it’s up to your spouse or next closest relative to make decisions related to your care. If they’re not supportive of your wishes, then an advance directive can ensure that your wishes are upheld.