Which of the following pulmonary function tests is most likely to be normal in the patient with interstitial pulmonary fibrosis?

Question

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In patients with interstitial pulmonary fibrosis, the ratio of FEV1 (forced expiratory volume in 1 second) to FVC (forced vital capacity) is often normal or even increased. This is because both FEV1 and FVC are reduced due to the restrictive nature of the disease, but their ratio remains relatively preserved.

Which of the Following Pulmonary Function Tests Is Most Likely