The purpose of this research study is to evaluate an experimental blood test to help doctors know when symptoms associated with COPD are becoming worse. Patients with breathing problems that are not COPD will also be enrolled. Experimental tests, such as those used on the blood collected in this study are also known as "investigational." This means the tests have not been approved by the U.S. Food and Drug Administration (FDA). In this study, the accuracy of these blood tests will be determined by comparing the results with other tests as determined by your study doctor.
Your participation in this study will be limited to:
The following tests and procedures will be done at the first study visit. If you return to the study doctor while the study is still ongoing, you will repeat these study procedures for a second time.