COPD – Mayo Clinic COPD Mayo Clinic - COPD (opens in new window) COPD www.mayoclinic.org/diseases-conditions/copd Chronic obstructive pulmonary disease mayoclinic.org/diseases-conditions/copd/home/ovc-20204882 COPD results COPD Mayo Clinic COPD mayoclinic.org/diseases-conditions/copd/home/ovc-20204882 COPD results COPD Chest X-rays can determine chronic obstructive pulmonary disease (COPD) Mayo Clinic COPD 20 to 30 percent