Skip to content

Asthma Health Center

Asthma and Lung Function Tests

Font Size
A
A
A

Other Tests You May Need if You Have Asthma

Even if your lung function tests are normal, your doctor may order other tests to see what could be causing your asthma symptoms.

  • Allergy tests are used to pinpoint substances called allergens to which you might be allergic. Your doctor might do such tests by pricking your skin with a tiny amount of the allergen, by injecting it under your skin, or by giving you a blood test. 
  • Gas and diffusion tests can measure how well your blood absorbs oxygen and other gases from the air you breathe. You breathe in a small amount of a gas, hold your breath, then blow out. The gas you exhale is analyzed to see how much your blood absorbed.
  • X-rays may tell if there are any other problems with your lungs or sinuses, or if asthma is causing your symptoms. High-energy radiation creates a picture of your lungs. You may be asked to briefly hold your breath while you stand in front of the X-ray machine.

In addition, you may need other tests to rule out other problems, such as sinus disease, gastroesophageal reflux disease (GERD), and heart problems.

WebMD Medical Reference

Reviewed by Varnada Karriem-Norwood, MD on September 06, 2014
1 | 2

When Is Your Asthma Worse?

When Is Your Asthma Worse?

Take the WebMD Asthma assessment to get Personalized Action Plan

Start Now

Today on WebMD

Lung and bronchial tube graphic
5 common triggers.
group jogging in park
Should you avoid fitness activities?
 
asthma inhaler
Learn about your options.
man feeling faint
What’s the difference?
 
Los Angeles skyline in smog
Slideshow
man in a field with allergies
Slideshow
 
Woman holding inhaler
VIDEO
Slideshow Allergy Myths and Facts
Slideshow
 

Pollen counts, treatment tips, and more.

It's nothing to sneeze at.

Loading ...

Sending your email...

This feature is temporarily unavailable. Please try again later.

Thanks!

Now check your email account on your mobile phone to download your new app.

Man outdoors coughing
Article
Lung and bronchial tube graphic
Article
 
10 Worst Asthma Cities
Slideshow
runner
Article