COPD GUIDE
COPD Stages: What Do GOLD 1–4 Mean?
Prof. Dr. Yalçın Karakoca · Last updated: 25 September 2026
SHORT ANSWER
COPD is divided into four stages based on the breathing test (spirometry). These are the mild, moderate, severe and very severe stages. In reports, these stages are written as GOLD 1, 2, 3 and 4. Your doctor also looks at how severe your symptoms are. You will also be asked how many flare-ups you have had in the past year. Your doctor chooses your medication on this basis. The stage shows how severe the disease is. But on its own, it does not determine life expectancy or the choice of treatment.
Stages based on the breathing test
One of the most important values in the breathing test is FEV1. This is the amount of air you blow out in the first second after a deep breath. This value is compared with the value expected for your age, height and sex. The stage is determined by this percentage.
| Stage | FEV1 (percentage of the expected value) | Usually |
|---|---|---|
| GOLD 1 — Mild | 80% or more | Few symptoms; there may be a long-lasting cough and phlegm |
| GOLD 2 — Moderate | 50–79% | Shortness of breath on exertion; most patients are diagnosed at this stage |
| GOLD 3 — Severe | 30–49% | Daily activities are limited; flare-ups become more frequent |
| GOLD 4 — Very severe | Below 30% | There may be shortness of breath at rest and signs of respiratory failure |
The requirement for diagnosis is the same at every stage. Even after a bronchodilator medicine, a persistent narrowing of the airflow must be seen.
Groups based on symptoms and flare-ups
Two patients at the same stage can feel very different. That is why your doctor measures your shortness of breath and daily symptoms with short questionnaires. You will also be asked about the flare-ups you have had in the past year. The international guideline divides patients into three groups:
| Group | Who? | Initial medication |
|---|---|---|
| A | Few symptoms; no more than one flare-up in the past year and no hospital admission because of a flare-up | A single long-acting bronchodilator medicine |
| B | Many symptoms; no more than one flare-up in the past year and no hospital admission because of a flare-up | Two different long-acting bronchodilator medicines |
| E | Two or more flare-ups in the past year, or at least one hospital admission because of a flare-up | Two bronchodilator medicines; if the number of eosinophils (a type of white blood cell) in the blood is high, a steroid inhaler is also added |
What does the stage tell you, and what does it not?
- What it tells you: It shows how much the airflow has narrowed. As the stage advances, the risk of flare-ups and other problems also broadly increases.
- What it does not tell you: It does not show how breathless you are. Breathing test results and symptoms do not always go hand in hand. Nor does it show how long you will live. Age, other health conditions, walking ability and how often you have flare-ups also matter. It also does not show which treatment, such as a balloon or a valve, is suitable. This is determined by the type of disease and the chest CT scan.
At what stage are bronchoscopic treatments considered?
A bronchoscope is a tube with a camera at its tip. It is passed through the mouth into the airways. These treatments are usually considered at the severe and very severe stages (GOLD 3–4). They are for selected patients whose symptoms persist despite medicines and a breathing exercise programme. If cough and phlegm predominate, balloon treatment is considered. If emphysema and air building up in the lungs predominate, a lung valve is considered. Being at stage 3 or 4 is not enough on its own. The decision is made on the basis of a consultation and tests.
Can stage progression be stopped?
Lung function that has been lost usually does not come back with medication. However, stopping smoking can bring the yearly loss of lung function closer to the rate of someone who does not smoke. Preventing flare-ups stops rapid losses. Exercise and pulmonary rehabilitation, in turn, increase your strength in everyday life.
PRELIMINARY ASSESSMENT
Is it suitable for you?
Book an appointment and bring your breathing test and chest CT scan reports. We decide together at the consultation. If you are coming from outside Istanbul, an online preliminary consultation can be held first.
Please bring: your breathing test, your chest CT scan report and images (CD/USB), your list of medicines and, if you have one, your blood gas test result.
RELATED PAGES
HAVE A QUESTION?
Frequently asked questions
The questions our patients and their relatives ask most often, with answers. We discuss questions about your own situation together at the consultation.
APPOINTMENT
Book an appointment for a preliminary assessment
To find out whether you are suitable, book a preliminary assessment appointment. Bring your breathing test, chest CT scan report and list of medicines with you.
info@yalcinkarakoca.com · Rüzgarlıbahçe Mah. Cumhuriyet Cad. Hasoğlu Plaza Kat:3, Kavacık / Beykoz, İstanbul
REFERENCES
- International COPD guideline (GOLD 2026 report); Turkish Thoracic Society COPD Diagnosis and Treatment Consensus Report.
This page is for general information purposes. It does not replace a medical examination or diagnosis. Treatment decisions are made during an examination, on an individual basis. In an emergency, call 112.
Medical content review: Prof. Dr. Yalçın Karakoca, Pulmonologist · Last updated: 25 September 2026