How effective is spirometry for COPD?

The test measures how much air you can exhale and how quickly. It helps identify persistent obstruction and gives your clinician a reference point for discussing symptoms, inhaler choices and follow-up. Results are interpreted with breathlessness, cough, sputum, smoking or occupational exposure and examination findings.

Spirometry does not measure every part of COPD. It cannot by itself show how often you flare, how active you can be, or whether another condition contributes to symptoms. A result may be affected by technique, recent illness and whether prescribed inhalers were used before testing.

Ask the clinic whether any inhaler should be withheld before the appointment; do not change prescribed treatment without clear instructions. Tell the team about recent infections, chest pain, dizziness and your usual activity level.

You will usually perform several coached breaths through a mouthpiece. Make a strong start and continue exhaling as instructed. Bring earlier lung-function results and note changes in walking tolerance, cough, sputum or rescue-inhaler use so the numbers can be interpreted meaningfully.

Arrange review if breathlessness is increasing, usual activities are becoming harder, or cough and sputum change. Seek urgent help for severe or sudden breathing difficulty, chest pain, blue lips, new confusion, fainting or inability to speak comfortably. Use your agreed flare-up plan when symptoms worsen.

Ask what the result says about airflow, whether it is comparable with your earlier test, how symptoms relate to the reading, and what plan will reduce flare-ups and preserve activity.