A 68-year-old woman with idiopathic pulmonary fibrosis (IPF) and a 35-year-old man with moderate asthma both undergo spirometry. Both show reduced FEV₁ (65% and 60% predicted, respectively). Which finding best distinguishes the restrictive pattern of IPF from the obstructive pattern of asthma?

See the options, answer & explanation

Sign in free to reveal the answer choices, the correct answer, the detailed explanation, and AI-powered insights for this question.