Lung Volumes

A lung volume test assesses both the total air capacity within your lungs and the volume of air remaining after maximal exhalation.

When is a lung volume test used?

A lung volume test helps determine whether a lung condition is restrictive or obstructive. In obstructive lung conditions, airways become narrow, causing air to remain in the lungs after exhalation. Such conditions include COPD and asthma.

Preparation

• Do not do any intense exercise 30 minutes before the test.
• Do not smoke 1 hour before the test 
• Do not eat a large meal 2 hours before the test
• Do not drink alcohol 4 hours before the test 

 How is a lung volume test done?

You will be seated and instructed to inhale through a tube. A nose clip will be applied to ensure no air escapes through your nose. The test typically lasts around 20 minutes.