What is the role of pulmonary function testing in the workup of pulmonary arterial hypertension (PAH)?

Updated: Apr 25, 2018
  • Author: Kristin E Schwab, MD; Chief Editor: Zab Mosenifar, MD, FACP, FCCP  more...
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Pulmonary function tests (ie, spirometry and diffusing capacity for carbon monoxide) should be performed in patients with pulmonary hypertension to exclude an underlying pulmonary disorder. Diffusing capacity is universally reduced in patients with pulmonary hypertension.

These tests may show an obstructive pattern suggestive of COPD or a restrictive pattern suggestive of an interstitial lung disease. Furthermore, the severity of the lung disorder may be established by pulmonary function test findings because these tests provide both qualitative and quantitative data.

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