22. Choice C is the correct answer. Idiopathic pulmonary fibrosis is demonstrated on PFT's by a restrictive pattern such as a decreased FVC and a reduced DLCO. There is scarring of the alveolar capillary membrane and decreased absorption of gases. Sarcoidosis is a restrictive lung disease but usually does not have a decreased DLCO. Cystic fibrosis shows obstructive findings such as a decreased FVC/FEV1 ratio. The DLCO is usually normal with CF.
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