Spirometry is generally a safe test. You may feel short of breath or dizzy for a moment after you perform the test.

Because the test requires some exertion, it isn't performed if you've had a recent heart attack or some other heart condition. Rarely, the test triggers severe breathing problems.

Aug. 17, 2017
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  2. Pulmonary function tests. National Heart, Lung, and Blood Institute. https://www.nhlbi.nih.gov/health/healthtopics/topics/lft. Accessed April 27, 2017.
  3. McCormack M, et al. Office spirometry. https://www.uptodate.com/contents/search. Accessed April 27, 2017.