Prior to Test

• Review your medicine with your doctor. You may need to stop taking some before testing.
• Do not eat, smoke, or exercise for 4 to 8 hours before testing.
• Wear loose-fitting clothing.

Description of Test

The exact steps will depend on the reason for the test. Most tests will ask you to breathe into a device. Examples include a spirometer or peak flow meter. They can measure the force of breath.

You may be asked to breathe in and out in different patterns and speeds. You will rest between tests.

Tell the care team right away if you have breathing problems, pain, or dizziness during the test.

Peak Flow Meter

Copyright © Nucleus Medical Media, Inc.

Other steps that may be needed include:

• A brief period of exercise before the test.
• A small clip will be attached to your finger. It will measure the amount of oxygen in your blood.
• A special chemical will be given as a vapor. You inhale the mist. If you have asthma the chemical will cause a spasm in the airway. This is only done under close supervision.
• You may be asked to breathe in small amount of carbon monoxide for 1 minute. It will be followed to see how much gets into your blood. This will show how well oxygen is getting into your blood.

After Test

Rest until you feel able to leave. You may have wheezing, coughing, and/or problems breathing. It will be treated before you leave.

How Long Will It Take?

20 to 45 minutes

Will It Hurt?

The test does not hurt. You may feel some symptoms during or right after testing.