Diffusion capacity for carbon monoxide is decreased in all of the following except
Diffusion capacity for carbon monoxide (DLCO) is usually nirmln in chronic bronchitis and other obstructive lung disease with the exception of empyseemp where it is decreased. Ref Harrison 19th edition pg 1710
Chronic bronchitis
Emphysema
Interstitial lung disease
Pulmonary embolism
Respiratory system