What to know before a spirometry test

During spirometry, you breathe through a mouthpiece connected to a spirometer. The device records how much air you move and how quickly you blow it out. You will usually repeat forceful breaths so the team can judge whether the results are consistent.

The test may help assess asthma, COPD, bronchiectasis, or a persistent cough. Results are interpreted with your symptoms, examination, and medical history; one reading does not explain every breathing problem.

Follow the appointment letter about inhalers and other medicines because some may need to be paused while others should be continued. Do not stop prescribed treatment without instructions. Avoid a heavy meal shortly before testing, wear loose clothing, and tell the team if you are unwell or recently had a chest infection.

Bring your inhalers or a medicine list. During the test, seal your lips around the mouthpiece, breathe as instructed, and tell the operator if coughing, dizziness, chest discomfort, or breathlessness prevents you from continuing.

Tell the testing team immediately if you develop chest pain, severe breathlessness, faintness, or distress during the test. Arrange medical advice for a marked change in your usual breathing before the appointment rather than trying to push through the test.

Ask: Which inhalers should I use or pause? Should I attend if I have a cough or infection? What will the result help diagnose? When and how will the findings be explained? Would inhaler therapy or a smoking cessation programme be discussed afterward if relevant?