How Severe Is My COPD?: Test Results vs. Symptoms

This article was written by Kalli Mago.

If you are living with chronic obstructive pulmonary disease (COPD), you may wonder how severe your condition is. COPD is a progressive disease, which means it gets worse over time. Understanding how severe your COPD is can help you make better choices to protect your lungs for the future.

When you were diagnosed with COPD, your health care provider might have told you what "stage" your COPD is. This number between 1 and 4 is based on your spirometry test results. It can help you understand your condition more.

While knowing your number can be useful, it doesn't always tell you everything about your condition. Sometimes, people have "mild" COPD according to their numbers, but their symptoms can be more severe. Other times, the opposite is true. You could have "severe" COPD but still feel fairly well most days.

So, what do you do if your numbers and your symptoms don't match? Let's start by understanding what COPD test results can and cannot tell us.

What Do My COPD Test Results Mean?

To diagnose you with COPD, your health care provider will use a spirometry test. This test measures how well your lungs work. During this test, you breathe into a special mouthpiece, which measures how much air you breathe out.

Results from this test include two important numbers:

• The amount of air you blew out in the first second—your forced expiratory volume in the first second (FEV₁)
• The total amount of air you blew out in one breath—your forced vital capacity (FVC)

Your health care provider will compare these two numbers to other people of a similar age to you. This can help you and your health care team understand how severe your condition is. In general, COPD is considered mild when FEV₁ is at least 80% of the amount they would expect based on your age. On the other hand, COPD is considered severe when FEV₁ is 30-50% of the expected number, and very severe when it is less than 30%.²

However, your test results do not always show the full picture. How you feel matters, too.

What are the Symptoms of COPD?

COPD is a chronic lung disease. There is currently no cure, but proper medical treatment can help you feel better and prevent the disease from getting worse too fast. Common symptoms include:

• Shortness of breath
• Lack of energy
• Cough
• Sputum (mucus) production¹

Dry mouth, body pain, difficulty sleeping, and lack of appetite are other common symptoms.¹

Different people may experience different symptoms, at different times and in different amounts. Whether your symptoms are mild or more severe depends both on how many symptoms you have, how often you experience them, and how much these symptoms affect your life.

How Does My Health Care Provider Assess My COPD Symptoms?

When you meet with your health care provider, they may ask some questions to see how severe your COPD symptoms are. The Global Initiative for Chronic Obstructive Lung Disease (GOLD) recommends two assessments to help your provider understand your symptoms:

1. the modified MRC (mMRC) dyspnea scale, which focuses on breathlessness, and
2. the CAAT assessment, which looks at many different aspects of your health and well-being²

The mMRC scale helps show how severe your COPD is by giving you a grade between 0 and 4:

• Grade 0: I only get breathless with strenuous exercise.
• Grade 1: I get short of breath when hurrying on the level or walking up a slight hill.
• Grade 2: I walk slower than people of the same age on the level because of breathlessness, or I have to stop for breath when walking on my own pace on the level.
• Grade 3: I stop for breath after walking about 100 meters or after a few minutes on the level.
• Grade 4: I am too breathless to leave the house or I am breathless when dressing or undressing.²

The CAAT assessment asks about many different symptoms you might experience, including cough, mucus, energy levels, sleep, chest tightness, and more. Your answers add up to a score between 0 and 40 based on how many symptoms you experience and how often you experience each one.

Why Do My Symptoms Say Something Different Than My Test Results?

So, why don't your symptoms always match your test results? Maybe your spirometry results say you have mild COPD, but you experience breathlessness and cough that make it hard to live normally. Or maybe your COPD is severe based on your numbers, but your symptoms don't bother you too much. What explains the mismatch?

COPD is a complicated disease. There are many different types of COPD. Spirometry only measures airflow obstruction, or how much your airways may be blocked. This is just one factor that can affect your breathing. This is one reason why your test results may not give a full picture of your lung health.³

People with COPD also often have other conditions, such as asthma or heart issues. Other conditions can increase your COPD symptoms, even if the numbers from your test results seem good. Some people with COPD also have a bigger risk of exacerbations, or flare-ups, even if they have more "mild" COPD according to the lung function tests. These flare-ups can make symptoms much worse.⁴

Sometimes, people with worse numbers may feel better than others who have similar results. This may be because of differences in the type of COPD each person has. Differences in fitness levels and other conditions can play a role, too. Plus, everyone feels things differently. What feels extreme for one person may be less noticeable to someone else.

If your COPD test results and your symptoms don't match, start a conversation with your doctor. Together, you can learn more about your condition and how it affects your life to manage it better.

1. Roberts M, Smith T, Wheatley J, Cho JG. Symptom Burden of Patients with Chronic Obstructive Pulmonary Disease Attending the Westmead Breathlessness Service: Prevalence, Associations, and Sex-Related Differences. Int J Chron Obstruct Pulmon Dis. 2023;18:2825-2837. Published 2023 Nov 30. doi:10.2147/COPD.S433541
2. Global Initiative for Chronic Obstructive Lung Disease. Global Strategy for Prevention, Diagnosis, and Management of COPD: 2026 Report. GOLD; 2026.
3. Kakavas, S., Kotsiou, O.S., Perlikos, F. et al. Pulmonary function testing in COPD: looking beyond the curtain of FEV1. npj Prim. Care Respir. Med. 31, 23 (2021). https://doi.org/10.1038/s41533-021-00236-w
4. Kim NE, Kang EH, Jung JY, et al. Subtypes of Patients with Mild to Moderate Airflow Limitation as Predictors of Chronic Obstructive Pulmonary Disease Exacerbation. J Clin Med. 2023;12(20):6643. Published 2023 Oct 20. doi:10.3390/jcm12206643