Spirometry meter: how it works

The meter is attached to a disposable mouthpiece or filter. It turns your breath into measurements of air volume and flow. The clinician watches the curve on the screen as well as the displayed values, because a cough, a leak around the mouthpiece, or stopping too soon can change the tracing.

A meter reading may help investigate wheeze, breathlessness, a long-lasting cough, or suspected asthma and COPD. It is not the same as checking oxygen with a fingertip device, and it cannot explain every cause of breathing difficulty.

Take the test exactly as demonstrated: sit tall, place the mouthpiece between your teeth, close your lips around it, breathe in fully, then blast the air out and keep going. Repeat attempts are normal because the team checks whether the results agree.

Avoid changing prescribed medicines unless the testing team tells you to. Mention recent respiratory infection, smoking, chest discomfort, or difficulty standing or sitting upright. If you become dizzy, stop, breathe normally, and let the clinician know.

Call for urgent help if breathlessness is sudden and severe, you cannot speak in full sentences, your lips look blue or grey, you collapse, or chest pain is new and intense. Arrange medical review for steadily worsening wheeze, cough, or reduced ability to walk or sleep.

Ask whether the meter produced an acceptable tracing, what each measurement represents, and whether your inhaler should be withheld before a repeat test. Ask when the result will be explained and what plan fits your symptoms rather than relying on the device alone.