Lung volume tests

Find out what lung volume tests are used for and what to expect on the day. 

2 min read

Patient receiving lung volume test

Looking at:

  • How much air your lungs can hold.1
  • How much air stays in your lungs when you breathe out fully.1

What to expect:

In a test called body plethysmography, you will be asked to sit in a small, see-through booth, a bit like a phone booth. You then need to breathe through a mouthpiece.2
In a test called the the nitrogen washout test, you will be asked to breathe in a mixture of gases through a tube, then blow them out.3

Understanding your results:

Fibrosis may have stiffened your lungs. If they have lost some of their elasticity, they won’t be able to expand as much, and your lung volume might be smaller.