If you are concerned about the health of your lungs and have symptoms that could be chronic obstructive pulmonary disease (COPD), see your GP as soon as you can. Being diagnosed early means you will receive appropriate advice, help and treatment to stop or slow the progression of COPD.
To find out if you have COPD, your doctor will ask you about your symptoms and how long you have had them, and whether you smoke or have smoked in the past. They will examine you and listen to your chest using a stethoscope. Your doctor will also check how well your lungs are working with a lung function test called spirometery.
Spirometry
To assess how well your lungs work, a breathing test called spirometry is carried out. You will be asked to breathe into a machine called a spirometer.
The spirometer takes two measurements: the volume of air you can breathe out in one second (called the forced expiratory volume in one second or FEV1) and the total amount of air you breathe out (called the forced vital capacity or FVC).
You may be asked to breathe out a few times to get a consistent reading.
The readings are compared with normal measurements for your age, which can show if your airways are obstructed.
Other tests
You will have other tests as well as spirometry. Often, these other tests will help the doctor rule out other conditions that cause similar symptoms.
Chest X-ray
A chest X-ray will show whether you have another lung condition which may be causing symptoms, such as lung cancer.
Blood test
A blood test will show whether your symptoms could be due to anaemia, as this can also cause breathlessness.
Further tests
Some people may need more tests. The tests may confirm the diagnosis or indicate the severity of your COPD. This will help you and your doctor plan your treatment.
Peak flow test
To confirm that you have COPD and not asthma, your doctor might ask you to take regular measurements of your breathing using a peak flow meter, at different times over several days. The peak flow meter measures how fast you can breathe out.
Blood oxygen level
The level of oxygen in your blood is measured using a pulse oximeter, which looks like a peg and is attached to the finger. If you have low levels of oxygen, you may need an assessment to see whether extra oxygen would help you.
Blood test for alpha-1-antitrypsin deficiency
If the condition runs in your family or you developed the symptoms of COPD under the age of 35 and have never smoked, you will probably have a blood test to see if you are alpha-1-antitrypsin deficient.
CT scan
Some people may need a CT scan. This provides more information than an X-ray and can be useful in diagnosing other lung diseases or assessing any changes to your lungs because of COPD.
Other breathing tests
If your symptoms seem worse than would be expected from your spirometry results, your doctor may decide you need more detailed lung function tests. You may be referred to a hospital specialist for these tests.
Heart tests
You may have an electrocardiogram (ECG) or an echocardiogram to investigate whether your heart has been affected by COPD.
Phlegm sample
The doctor may take a sample of phlegm to check whether it has been infected.
