There are lots of tests which can be done to investigate breathing problems and how well your lungs are working.
Sources of information about respiratory, breathing and lung function tests
Breathing and lung function tests - British Lung Foundation (BLF)
Tests to measure your breathing - British Lung Foundation (BLF)
Peak flow - My lungs, my life
Spirometry - My lungs, my life
Tests to measure your oxygen levels - British Lung Foundation (BLF)
Imaging scans - British Lung Foundation (BLF)
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