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How Do I Interpret My Spirometry Test?

By Deborah Leader, RN, About.com

Updated July 02, 2009

About.com Health's Disease and Condition content is reviewed by the Medical Review Board

Question: How Do I Interpret My Spirometry Test?
A spirometry test is a type of pulmonary function test (PFT) that helps doctors diagnose the presence and severity of COPD. For many COPD patients, however, PFTs are one of the most misunderstood concepts of understanding the disease. In fact, the COPD Forum is literally filled with questions about PFTs, the most frequent being "how do I interpret my spirometry test"?
Answer: It is only natural to want to know how well your lungs are functioning. While you may be tempted to learn how to read your spirometry test yourself, or ask others to interpret them for you, in reality the test is very complicated and takes years of training to learn how to do and understand them. Why?

There is more to reading a spirometry test than just looking at a series of numbers. Before the tests are interpreted, demographic information such as age, sex, height, weight and smoking history is input into the spirometor machine. Someone who interprets your results without knowing your medical history is doing you a terrible injustice.

To get an accurate interpretation of your spirometry test, it is best to leave it up to the professionals. PFTs are interpreted from highly sophisticated tables that cannot be simplified. All patients are strongly encouraged to ask their pulmonary specialist any and all questions regarding the results of their tests. Not only will this foster the doctor-patient relationship, but it will give you peace of mind that may otherwise be lacking when someone other than your doctor attempts to read your test.

Don't be discouraged, however, because your COPD Guide is always available to help you better understand the test itself and why it is important to have one. Please present any questions you have about PFTs in the COPD Forum under the following thread:

Pulmonary Function Tests Q & A in the COPD Forum

How Important Is Your Effort in Pulmonary Function Testing?

If you feel you did not put forth your greatest effort during the test, say something - some technicians may ask that you repeat the test.

To learn more about pulmonary function testing visit the following article:

Understanding Pulmonary Function Tests

And, if you are a bit nervous about questioning your doctor at your next visit, here are a few tips:

How to Prepare for Your Next Doctor's Visit

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