Ball spirometer use: what the device can show

This simple device usually has chambers with lightweight balls that rise when you breathe in or blow out. The movement reflects airflow through the device, not a complete picture of lung capacity, oxygen level, or airway health. Technique, mouth seal, posture, and the device design affect the result. It should not be confused with a clinical [Spirometer](/technology/spirometer/) used for formal [Spirometry](/treatments/diagnostics-and-screening/spirometry/).

Sit upright, keep the device level, seal your lips around the mouthpiece, and follow the breathing direction supplied with that model. Take a calm breath first if instructed, then perform the manoeuvre without forcing beyond your comfort. Clean the mouthpiece as directed and do not share it. Practise only as often as your clinician recommends. Record the reading or ball movement alongside symptoms, but do not alter inhalers or other treatment based on the device alone.

Stop if the manoeuvre causes marked dizziness, chest pain, or worsening breathlessness. Seek urgent help for severe difficulty breathing, blue or grey lips, confusion, fainting, or sudden chest pain. A concerning device result with new symptoms needs medical assessment; a reassuring ball movement does not rule out a serious problem.

Ask which breathing manoeuvre your device uses, what result is expected for you, how often to record it, how to clean it, and which symptoms override the reading.