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Lung Disease & Respiratory Health Center

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Lung Function Tests

What Affects the Test

Reasons you may not be able to have the test or why the results may not be helpful include:

  • Using medicine, such as albuterol, that expands the lungs' airways within 4 hours of the test.
  • Using sedatives before the test.
  • Eating food or drinks that contain caffeine before the test.
  • Not being able to breathe normally because of pain.
  • Pregnancy, obesity, or an enlarged stomach (after a large meal, for example).
  • Not being able to follow instructions or make an effort during the tests.

What To Think About

Other Works Consulted

  • Chernecky CC, Berger BJ (2013). Laboratory Tests and Diagnostic Procedures, 6th ed. St. Louis: Saunders.

  • Fischbach FT, Dunning MB III, eds. (2009). Manual of Laboratory and Diagnostic Tests, 8th ed. Philadelphia: Lippincott Williams and Wilkins.

  • Gustafsson PM, et al. (2008). Multiple-breath inert gas washout and spirometry versus structural lung disease in cystic fibrosis. Thorax, 63(2): 129–134.

  • Pagana KD, Pagana TJ (2010). Mosby’s Manual of Diagnostic and Laboratory Tests, 4th ed. St. Louis: Mosby.

ByHealthwise Staff
Primary Medical ReviewerE. Gregory Thompson, MD - Internal Medicine
Specialist Medical ReviewerMark A. Rasmus, MD - Pulmonology, Critical Care Medicine, Sleep Medicine
Last RevisedApril 25, 2013
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WebMD Medical Reference from Healthwise

Last Updated: April 25, 2013
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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