Lung Diffusion Capacity Testing (DLCO)

This test measures how well gases (oxygen) move through the lung and into the bloodstream. A technologist will instruct you on how to perform the test and coach and encourage you to do your best.

Performing the test

1. You will be on a mouthpiece wearing noseclips. It is important to keep a tight seal on the mouthpiece. You will breathe normally
2. You will then be asked to blow out all your air until you are empty
3. You will then be told to take a big deep breath and fill up completely
4. You will hold your breath for a very short time
5. Then you will be asked to blow it out
6. We will analyze the gas you blow out to see how much went through your lungs into your bloodstream