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The Mann-Whitney U-test is used to test whether two independent samples of observations are drawn from the same or identical distributions. An advantage with this test is that the two samples under consideration do not necessarily need to have the same number of observations or instances.
The PFT test called diffusion capacity (DLCO) provides information about the transfer of gas between the alveoli and the pulmonary capillary blood. The NMMC lab uses the single breath or intra breath method, which involves your breathing through the same mouthpiece as with the spirometry. The complete pulmonary function test (or complete PFT) requires you to perform the spirometry, lung volume, and DLCO. The therapist may perform tests that measure how your lungs respond to outside factors such as medications, allergens or exercise. This test is called the methacholine challenge.