Spirometry

What is a Spirometry test

A spirometry test measures how much air you can breathe out in one breath. It's used to check how well your lungs are working and look for any problems. It is also called a lung function test.

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Spirometry

You might be referred for a spirometry test to:

  • find out if symptoms you’ve been having are caused by a lung condition, such as asthma, chronic obstructive pulmonary disease (COPD), or pulmonary fibrosis
  • monitor a lung condition if you already have one, for example to see how well treatment is working
  • check your general health before having surgery

You may also be offered a test if:

  • you’re over 55 and smoke, as part of lung cancer screening
  • you’re at risk of having a lung condition

You will be sent an appointment or told how to book one.

Spirometry is harmless for everyone.

Physical effects (usually transient):

  • Lightheadedness or dizziness
  • Shortness of breath
  • Coughing

  • You are seated and wear a nose clip.
  • You inhale fully, then exhale as hard and fast as possible into a mouthpiece.
  • The manoeuvre is repeated (usually 3–8 times) to ensure reproducibility.

  • Your effort matters: The test works best when you follow the instructions carefully and blow out as hard as you can. You may be asked to repeat the test a few times to get accurate results.
  • If you’re unwell: Colds, chest infections, or flare-ups of breathing symptoms can affect results. If you’re feeling unwell on the day, the test may be rearranged.
  • Using inhalers: You may be asked to avoid certain inhalers before the test. Your healthcare professional will let you know if this applies to you.
  • Recent surgery or heart problems: Let your clinician know if you’ve recently had surgery, chest pain, or heart problems, as spirometry may not be suitable in some situations.
  • Understanding your results: Spirometry is just one part of your assessment. Your results will be looked at alongside your symptoms and medical history.
  • Hygiene and safety: Single-use mouthpieces and filters are used to keep the test clean and safe.

How to use our services

You can be seen through the NHS or as a private patient. You’ll need a referral first, and we’ll check it to make sure this service is right for you.

NHS Referral Going Private

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