Understanding the 4 Stages of COPD: A Clear Patient Guide
Medically Reviewed and Compiled by Dr. Adam N. Khan, MD. Quick Answer: The 4 Stages of COPD Chronic Obstructive Pulmonary Disease (COPD) is categorized into four stages based on the GOLD System (Global Initiative for Chronic Obstructive Lung Disease). These stages are determined by how well your lungs function during a breathing test called spirometry: Living with … Read more