The 4 Stages of COPD
If you are diagnosed with COPD, your stage is determined by your symptoms and your lung function.
Your doctor can determine your lung function using a machine called a spirometer, which tests how well you can
breathe air in and out of your lungs.
Since the symptoms of COPD worsen over time, your stage is likely to progress as well. Talk to your doctor to
find out which medications are best for you.
Stage 1: Mild
Mild COPD is usually characterized by mild airflow limitation. Chronic cough and mucus production are some of the
possible symptoms, but often a person with mild COPD is unaware that his/her lung function is abnormal. TUDORZA has
not been studied in patients with mild COPD.
Stage 2: Moderate
With moderate COPD, the airflow limitation worsens. Shortness of breath can also occur, typically after exertion.
At this stage, patients typically begin to seek medical attention because of their symptoms.
Stage 3: Severe
At stage 3, patients experience more limited breathing during the day and night, along with greater shortness of breath,
and increased mucus while coughing. They can also have difficulty recovering from lung infections or colds and may need
oxygen therapy. It is estimated that about 71% of severe patients have chronic bronchitis.
Stage 4: Very Severe
In the case of very severe COPD, patients will experience all of the previously mentioned symptoms along with very limited
airflow and possible respiratory failure, which can lead to heart failure.
To find out how these symptoms can be treated, visit