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.