Spirometry is a test of how well you can breathe and can help in the diagnosis of different lung diseases such as chronic obstructive pulmonary disease (COPD).
The test requires taking in a very deep breath and blowing out as fast as possible into a small device called a spirometer.
Watch the video to learn how to take a test (this video was filmed at the 2009 European Respiratory Society annual congress in Vienna, Austria, courtesy of x-audio/soundbakery).