tci Part B Insider - 2012 Issue 5

Understanding Diffusing Capacity Tests

Carbon monoxide diffusing capacity and membrane diffusion capacity form a part of complete pulmonary function tests that also include spirometry, lung volume(s), flow volume loop and airway resistance.Carbon monoxide diffusing capacity is a pulmonary function test that helps measure the available surface of the lung for diffusion. It also gives an idea about the volume of blood in the pulmonary capillaries, as well as finding the thickness of the alveolar capillary barriers. The test also helps understand the ability of the lungs to exchange oxygen and carbon dioxide to the bloodstream. "The test can diagnose certain lung diseases...

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