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Diagnosis

Asthma can usually be diagnosed from your symptoms and some simple tests.

A GP will probably be able to diagnose it, but they may refer you to a specialist if they're not sure.

Seeing a GP

The GP may ask:

  • what symptoms you have
  • when they happen and how often
  • if anything seems to trigger them
  • if you have conditions such as eczema or allergies, or a family history of them

They may suggest doing some tests to confirm if you have asthma.

These cannot always be done easily in young children, so your child may be given an asthma inhaler to see if it helps relieve their symptoms until they're old enough to have the tests.

Tests for asthma

The main tests used to help diagnose asthma are:

  • FeNO test – you breathe into a machine that measures the level of nitric oxide in your breath, which is a sign of inflammation in your lungs
  • spirometry – you blow into a machine that measures how fast you can breathe out and how much air you can hold in your lungs
  • peak flow test – you blow into a handheld device that measures how fast you can breathe out, and this may be done several times over a few weeks to see if it changes over time

After you're diagnosed with asthma, you may also have a chest X-ray or allergy tests to see if your symptoms might be triggered by an allergy.

Asthma + Lung UK: diagnosing asthma

Last Reviewed
26 September 2023
NHS websiteNHS website
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Hedgegrail Pharmacy in Stoke Poges offers a wide range of prescription and over-the-counter medications, as well as health and beauty products
Company Registration: 2041755
Premises GPhC: 1099892
Superintendent: Baljit Singh Bahra
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