How is asthma diagnosed?
Your health care professional makes a diagnosis of asthma based on your symptoms, family history of allergies and the results of breathing tests.
If you have asthma, your symptoms will tend to:
- come and go over a period of time
- be worse at night and in the early morning
- be made worse when you come into contact with a trigger like smoke
Breathing tests help to confirm the diagnosis. People with asthma symptoms have narrowed airways so they breathe less air out. The amount of air you breathe out is measured by spirometry or by a peak flow meter, which you can use at home.
Your health care professional may also do other breathing tests. For example, to measure inflammation of the lung lining or a chest X-ray to help to rule out other lung problems.