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What tests will I have?

There is no single test to diagnose severe asthma. Everyone with asthma is different, so the tests may vary depending on your individual asthma symptoms, medical history and any other conditions that your doctor needs to assess or rule out.

Learn more about diagnosis and testing for asthma, such as spirometry and peak flow.

Most of these tests will be performed at a respiratory specialist centre or lung function testing laboratory.

Some tests that may be used to help diagnose severe asthma:

Severe asthma tests

Allergy test

Asthma control test or questionnaire

Blood test


Chest x-ray

CT scan



Induced sputum test


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