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Lung function tests measure how well your lungs work. They can measure: how much air you can take into your lungs; how much air you can blow out of your lungs and how fast you can do it; how well your lungs deliver oxygen to your blood; and the strength of your breathing muscles.

These tests are used to look for the cause of breathing problems and to help diagnose conditions such as asthma and COPD (chronic obstructive pulmonary disease). Lung function tests can also be used to monitor lung growth and development, damage to the lungs and  how well treatments work.

For further information about lung function (PDF), please visit the ELF website.

Lung function in infants

Lung function in school-aged children