What is a Lung Volume Test (Plethysmography)?
Plethysmography is also known as a lung volume test. Plethysmography measures how much air your lungs hold. Some disorders and diseases may decrease or increase this measurement.
Description of the Test
Plethysmography is done with your child sitting in an enclosed plexiglass chamber that allows your child and therapist to see in and out. The child and therapist will also be able to hear each other through the plexiglass. Your child will place padded nose clips on their nose and place their mouth around a single-use, disposable, filtered mouthpiece. Your child will place their hands on their cheeks, breathe normally, and then "pant" in and out for a few seconds. After panting, your child will go back to breathing normally, take a deep breath in, and then blow air out.
Length of Test
Plethysmography is typically performed along with spirometry. Both tests combined can take up to 40 to 60 minutes.
Preparing Your Child for the Test
Please contact your healthcare provider to see if your child needs to temporarily stop taking any medications before the test.
Possible Side Effects of the Test
There are no side effects. Your child may resume normal activities and medications after testing.
