Diffusing Capacity of the Lungs for Carbon Monoxide Test

A 62-year-old man presented with a 4- to 6-month history of increasing exertional dyspnea. His measured hemoglobin was 15.3 g/dL and diffusing capacity of the lungs for carbon monoxide was 9.80 mL/min/mm Hg. How would you interpret these test results?

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