# Post bronchodilator test

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| name            = Post bronchodilator test
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| purpose         =assess reversibility of bronchoconstriction
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The '''post bronchodilator test''' ('''Post BD'''), also commonly referred to as a '''reversibility test''', is a test that utilizes [spirometry](/source/spirometry) to assess possible reversibility of bronchoconstriction in diseases such as [asthma](/source/asthma).

==Indications==
This procedure is indicated in the diagnosis and follow-up of asthma, and in the differentiation between asthma and [COPD](/source/COPD).<ref>{{Cite journal|title = Diagnostic value of post-bronchodilator pulmonary function testing to distinguish between stable, moderate to severe COPD and asthma|journal = International Journal of Chronic Obstructive Pulmonary Disease|date = 2008-12-01|issn = 1176-9106|pmc = 2650596|pmid = 19281083|pages = 693–699|volume = 3|issue = 4|first1 = Daphne C|last1 = Richter|first2 = James R|last2 = Joubert|first3 = Haylene|last3 = Nell|first4 = Mace M|last4 = Schuurmans|first5 = Elvis M|last5 = Irusen|doi = 10.2147/copd.s948 | doi-access=free }}</ref><ref>{{Cite web|title = Flow and volume responses after routine salbutamol reversibility testing in mild to very severe COPD - Respiratory Medicine|url = http://www.resmedjournal.com/article/S0954-6111(06)00501-4/abstract?cc=y=|website = www.resmedjournal.com|access-date = 2016-02-23}}</ref>

==Procedure==
An initial [spirometry](/source/spirometry) is performed to assess the patient's native respiratory status. The patient will be asked to take a deep breath and then blow into the mouthpiece of the spirometer as hard as you can. This is a baseline measurement. A dose of [bronchodilator](/source/bronchodilator) medication is administered by means of inhaler or nebulizer (such as 400mcg of [salbutamol](/source/salbutamol) (also known as albuterol)). You will wait about 15 minutes and then the spirometry is repeated.<ref>{{Cite web|title = Bronchodilator Reversibility Testing - Online Medical Encyclopedia - University of Rochester Medical Center|url = https://www.urmc.rochester.edu/encyclopedia/content.aspx?ContentTypeID=56&ContentID=DM118|website = www.urmc.rochester.edu|access-date = 2016-02-23}}</ref> An increase in FEV1 (or forced expiratory volume in the first second of a forced exhalation) of >200ml is considered a positive result. Bear in mind, however, that this number does not apply to children, and that it can differ depending on the patient's native result; small patient's with [pulmonary fibrosis](/source/pulmonary_fibrosis), [restrictive lung disease](/source/restrictive_lung_disease) etc. will have a measurably lower FEV1 than healthy average-sized adults. This can give a false positive result of the test.

== References ==
<references />

Category:Pulmonary function testing

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Adapted from the Wikipedia article [Post bronchodilator test](https://en.wikipedia.org/wiki/Post_bronchodilator_test) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Post_bronchodilator_test?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.