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What is Following are true about COPD, except and explain in detail?
COPD is an obstructive lung disease. Obstructive diseases have reduced FEV1, FVC and reduced FEV1/FVC. Flow rates like MEFR (Maximal Expiratory Flow Rate ) are also reduced. 
Due to air-trapping, the residual volume is increased. 
Reduction in DLco is seen interstitial lung diseases or pneumonias, not in COPD . 
DLco may be reduced in Emphysema due to alveolar damage.