What is a Diffusion Test?
Diffusion tests measure gas transfer from the lungs into the bloodstream. Lung disease can cause changes in this measurement.
How is the Test Done?
Diffusion is measured by having your child place padded nose clips on their nose and placing their mouth around a clean, filtered mouthpiece. The mouthpiece is connected to a computer.
Your child will be instructed to breathe normally, exhale fully, take a large quick breath in of a mixture of gases, hold for 8 seconds, and then fully exhale. The test will be repeated up to 5 times with a break in between trials.
How Long Does It Take?
Diffusion tests are performed with other tests and could take up to one hour.
How Does My Child Prepare?
Avoid the following activities:
- Smoking 24 hours before the test
- Eating two hours before testing
- Exercising within one hour of testing
Are There Side Effects?
There are no side effects from diffusion testing, and your child may resume normal activities after testing.
The mixture of gases includes a small amount of carbon monoxide that is safe for children of any age.
