What should you know about a flow-oriented spirometer?

During the test, air passes through a sensor and the device turns that movement into a reading. The clinician may look at how quickly you start, how strongly you exhale and whether repeated efforts are consistent. A low or unusual result can have several explanations, including poor seal, incomplete effort, airway narrowing or reduced lung expansion, so it needs clinical context.

Wear comfortable clothing and tell the tester about breathlessness, coughing, recent chest illness and medicines. Follow each instruction closely: use the mouthpiece correctly, keep your tongue clear, inhale fully when asked and exhale until told to stop. Give your best safe effort, but pause if you feel unwell. The team may repeat the manoeuvre to check that the pattern is reliable.

Report new chest discomfort, troublesome coughing, dizziness or worsening breathlessness during or after testing. Emergency care is needed for severe or rapidly worsening breathing difficulty, blue or grey lips, confusion, fainting or inability to speak normally because of breathlessness.

Ask which part of the reading is relevant to your symptoms, whether the test should be repeated, and what preparation is needed next time. Ask when you should use prescribed reliever treatment and when symptoms require urgent review.