The DLCO would be decreased in all of the following except:

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DLCO (Diffusing Capacity of the Lung for Carbon Monoxide) measures how well gases can pass from the air sacs of the lungs into the blood. In pulmonary emphysema and pulmonary fibrosis, the lung tissue is damaged, reducing gas exchange efficiency. Severe anemia reduces the blood's capacity to carry oxygen, impacting the test. However, secondary polycythemia, characterized by an increased number of red blood cells, does not decrease DLCO and can actually increase it due to the higher hemoglobin available for gas exchange.

The DLCO Would Be Decreased in All of the Following