An "advance health care directive" lets your physician, family and friends know your health care preferences, including the types of special treatment you want or don't want at the end of life, your desire for diagnostic testing, surgical procedures, cardiopulmonary resuscitation and organ donation. By considering your options early, you can ensure the quality of life that is important to you and avoid having your family "guess" your wishes or having to make critical medical care decisions for you under stress or in emotional turmoil.