Instant spirometer: what to know

A spirometer is a breathing-measurement device connected to a mouthpiece. During Spirometry, you usually inhale fully, seal your lips around the mouthpiece, and exhale forcefully for as long as instructed. The test can estimate the amount of air exhaled and the speed of flow. Clinicians compare the pattern with symptoms, examination findings, age, height, and other relevant factors. A result can be affected by poor technique, tiredness, coughing, a leak around the mouthpiece, or not following the instructions.

Follow the clinic or device instructions rather than trying to force a reading. Sit or stand as directed, keep the mouthpiece clean, and repeat only as advised. Record the date, symptoms, and whether the effort felt complete when monitoring at home. Do not change an inhaler or other prescribed treatment based on one number. Bring the device or its readings to an appointment so they can be checked against the testing method and your usual pattern. The Spirometer page can help you understand the equipment.

Seek emergency help for severe breathlessness, blue or grey lips, inability to speak in full sentences, fainting, confusion, or rapidly worsening wheeze. Contact a clinician promptly if readings repeatedly fall below your personal plan, breathing becomes harder than usual, or a new cough, chest pain, fever, or coughing blood develops. A device result should never delay urgent assessment when symptoms are severe.

Ask which measurements matter for your condition, how to perform the manoeuvre correctly, whether medicines should be paused before testing, and what symptoms require urgent action. Ask how often testing is useful and how your readings will be interpreted alongside formal Spirometry.