Asthma in the older person

4) Breathing tests to confirm asthma – Peak Flow


Peak expiratory flow (peak flow) measures tightness in the larger breathing tubes or ‘upper airways’.

  • You will be asked to take a deep breath in, and blow ‘hard and quickly’ into the peak flow meter.
  • Sometimes you will be asked to do this before and after some puffs of inhaler.
  • Sometimes you will be asked to do some measurements at home over a week or so once you are shown how to measure your ‘peak flow’ yourself. This is called ‘serial peak flow’.

See more on peak flow.