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Spirometry Tests for COPD

Topic Overview

Spirometry is the best test to assess lung function. It often is used to evaluate a person who has a chronic cough and sputum (mucus) production and a history of risk factors for chronic obstructive pulmonary disease (COPD), even if shortness of breath is not present. It is also used to find out whether a specific therapy has improved lung function or whether your lung disease is getting worse.

Spirometry testing may be done in your doctor's office or in a hospital. During the test:

  • A tube is connected to the spirometer.
  • You place your mouth on the tube and take the deepest breath possible.
  • You then blow out as hard and as fast as possible.

This should be repeated several times during the visit to ensure accurate results.

This test measures the flow and amount of air when you breathe in and out as deeply and forcefully as you can. For people with COPD, the test is divided into:

  • Forced expiratory volume in 1 second (FEV1), the amount of air breathed out as forcefully as possible in 1 second. The FEV1 value can help your doctor estimate the severity of COPD.
  • Forced vital capacity (FVC), the amount of air that can be forcibly breathed out after taking a deep breath.

The normal values for each of the measurements depend on your age, height, gender, and race. This is known as the predicted value. People with COPD typically have a reduction in FEV1 and may also have a reduction in FVC. A reduction in the ratio of FEV1 to the FVC points to airway obstruction, including COPD and asthma.

These measurements help your doctor diagnose COPD and find out the severity of the disease.

Credits

By Healthwise Staff
Primary Medical Reviewer E. Gregory Thompson, MD - Internal Medicine
Specialist Medical Reviewer Ken Y. Yoneda, MD - Pulmonology
Current as of March 12, 2014

This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.

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