Asthma and Lung Function Tests Q & A

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What is lung function testing?

Lung function testing, also called pulmonary function testing, is a set of breathing tests that measure how well your lungs work. The most common test, spirometry, is quick and non-invasive, showing how much and how fast you can exhale.

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This test helps your provider:

• Diagnose conditions such as asthma or other breathing problems

• Monitor how well your current treatment is working

• Identify changes in lung health over time

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When is lung function testing needed?

A pulmonary function test is usually recommended when someone has symptoms like chronic cough, wheezing, shortness of breath, or difficulty exercising. It’s also indicated to:

• Diagnose conditions such as asthma, COPD, or other lung disorders

• Monitor lung function in people with known respiratory conditions

• Assess lung health before surgery or certain medical treatments

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How is a lung function test performed and is it safe?

During the test, you’ll be asked to take a deep breath and then blow forcefully into a device called a spirometer. The test is quick, safe, and done right in the office.

 

Most people have no problems with this test, though some may feel lightheaded, tired, or short of breath briefly during or after the test. Serious complications are extremely rare.

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Sometimes your provider will give a quick-acting inhaler, usually albuterol, during lung function testing. This helps determine how much your lungs improve with medication, which can guide diagnosis and treatment.

Albuterol is generally safe when used for testing, but some people may experience:​

• Mild shakiness or tremor

• Rapid heartbeat or palpitations

• Temporary headache or nervousness

• Slight throat or mouth irritation

 

These side effects are usually short-lived and resolve within a few minutes. Your provider will monitor you closely during the test.