This study will enroll all COPD patients undergoing an evaluation for lung transplantation at the Washington University Medical Center and Barnes-Jewish Hospital in St. Louis, Missouri. Participants will attend study visits at the time of the transplant evaluation and again just prior to listing in the UNOS system. After the transplant, participants will attend study visits at Months 3 and 6 and then once a year for 5 years. During each study visit, participants will complete a computerized interview and health-related questionnaires that will assess quality of life factors, including social life, work life, and home life. Study researchers will also review participants' medical records to collect information on lung function and blood test results.